Methylene

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Gas phase ion energetics data

Go To: Top, Ion clustering data, Vibrational and/or electronic energy levels, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data evaluated as indicated in comments:
L - Sharon G. Lias

Data compiled as indicated in comments:
B - John E. Bartmess
LLK - Sharon G. Lias, Rhoda D. Levin, and Sherif A. Kafafi
RDSH - Henry M. Rosenstock, Keith Draxl, Bruce W. Steiner, and John T. Herron

View reactions leading to CH2+ (ion structure unspecified)

Quantity Value Units Method Reference Comment
IE (evaluated)10.396 ± 0.003eVN/AN/AL
Quantity Value Units Method Reference Comment
Δf(+) ion328. ± 3.kcal/molN/AN/A 
Quantity Value Units Method Reference Comment
ΔfH(+) ion,0K329. ± 3.kcal/molN/AN/A 

Electron affinity determinations

EA (eV) Method Reference Comment
0.6520 ± 0.0060LPESLeopold, Murray, et al., 1985Singlet-triplet splitting of CH2 = 9.0 kcal; B
<0.600 ± 0.030PDFeldman, Rackwitz, et al., 1977B
0.210 ± 0.015LPESEngelking, Corderman, et al., 1981Hot band problem; B
0.208 ± 0.031LPESZittel, Ellison, et al., 1976Hot band problem, singlet-triplet splitting = 19.5 kcal; B
>0.90 ± 0.40EIAEThynne and MacNiel, 1971From CH2=CH2; B

Ionization energy determinations

IE (eV) Method Reference Comment
10.35 ± 0.15EIReineke and Strein, 1976LLK
10.5 ± 0.2EINiehaus, 1967RDSH
10.396 ± 0.003SHerzberg, 1961RDSH

De-protonation reactions

CH- + Hydrogen cation = Methylene

By formula: CH- + H+ = CH2

Quantity Value Units Method Reference Comment
Δr386.05 ± 0.44kcal/molD-EAKasdan, Herbst, et al., 1975gas phase; B
Quantity Value Units Method Reference Comment
Δr379.29 ± 0.53kcal/molH-TSKasdan, Herbst, et al., 1975gas phase; B

Ion clustering data

Go To: Top, Gas phase ion energetics data, Vibrational and/or electronic energy levels, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled as indicated in comments:
B - John E. Bartmess
RCD - Robert C. Dunbar

Note: Please consider using the reaction search for this species. This page allows searching of all reactions involving this species. Searches may be limited to ion clustering reactions. A general reaction search form is also available.

Clustering reactions

(CH3- • 4294967295Methylene) + Methylene = CH3-

By formula: (CH3- • 4294967295CH2) + CH2 = CH3-

Quantity Value Units Method Reference Comment
Δr94.98 ± 0.80kcal/molN/AEllison, Engelking, et al., 1978gas phase; B

Cobalt ion (1+) + Methylene = (Cobalt ion (1+) • Methylene)

By formula: Co+ + CH2 = (Co+ • CH2)

Quantity Value Units Method Reference Comment
Δr75.9 ± 1.2kcal/molCIDTHaynes and Armentrout, 1994RCD

Chromium ion (1+) + Methylene = (Chromium ion (1+) • Methylene)

By formula: Cr+ + CH2 = (Cr+ • CH2)

Quantity Value Units Method Reference Comment
Δr53.8 ± 1.9kcal/molCIDTGeorgiadis and Armentrout, 1989RCD

Lanthanum ion (1+) + Methylene = (Lanthanum ion (1+) • Methylene)

By formula: La+ + CH2 = (La+ • CH2)

Quantity Value Units Method Reference Comment
Δr98.2 ± 1.4kcal/molCIDTSunderlin and Armentrout, 1989RCD

Scandium ion (1+) + Methylene = (Scandium ion (1+) • Methylene)

By formula: Sc+ + CH2 = (Sc+ • CH2)

Quantity Value Units Method Reference Comment
Δr98.3 ± 5.3kcal/molCIDTSunderlin and Armentrout, 1989RCD

Yttrium ion (1+) + Methylene = (Yttrium ion (1+) • Methylene)

By formula: Y+ + CH2 = (Y+ • CH2)

Quantity Value Units Method Reference Comment
Δr95.2 ± 3.0kcal/molCIDTSunderlin and Armentrout, 1989RCD

Vibrational and/or electronic energy levels

Go To: Top, Gas phase ion energetics data, Ion clustering data, References, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Data compiled by: Marilyn E. Jacox

State:   4p


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 74254 gas Irikura, Johnson, et al., 1992

State:   D


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 71592 gas D-X 140 140 Herzberg, 1961, 2
Irikura and Hudgens, 1992

State:   C


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 70917 gas C-X 141 141 Herzberg, 1961, 2
Irikura and Hudgens, 1992

State:   3d 3A2


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 70634 gas 3d3A2-X 142 142 Herzberg, 1961, 2
Irikura and Hudgens, 1992

State:   3p


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 64126 gas Irikura, Johnson, et al., 1992

State:   c


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

gas c-a 330 362 Herzberg and Johns, 1966
Kim, Komissarov, et al., 2005
Kim, Hall, et al., 2006

State:   b


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 11497 ± 10 gas b-a 465 1400 Herzberg, 1961, 2
Herzberg and Johns, 1966
McKellar, Bunker, et al., 1983
Petek, Nesbitt, et al., 1987
Green, Chen, et al., 1989
Hartland, Xie, et al., 1992
Hartland, Qin, et al., 1993
Garcia-Moreno and Moore, 1993
Qin, Hartland, et al., 1994
Chang, Wu, et al., 1994
Fockenberg, Marr, et al., 1998
Marr, Sears, et al., 1998
Kobayashi, Pride, et al., 2000
Kobayashi and Sears, 2001
Hall, Komissarov, et al., 2004
Kobayashi, Hall, et al., 2006
Chang, Wang, et al., 2011
Chang, Xin, et al., 2011


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 2 Bend 570 T gas AB Herzberg and Johns, 1966

State:   a


 Energy 
 (cm-1
 Med.   Transition   λmin 
 (nm) 
 λmax 
 (nm) 
 References

To = 3147 ± 5 gas b-a 465 1400 Herzberg, 1961, 2
Herzberg and Johns, 1966
McKellar, Bunker, et al., 1983
Leopold, Murray, et al., 1985
Bunker and Sears, 1985
Bunker, Jensen, et al., 1986
Petek, Nesbitt, et al., 1987
Petek, Nesbitt, et al., 1987, 2
Jensen and Bunker, 1988
Xie, Harkin, et al., 1989
Xie, Harkin, et al., 1990
Hartland, Xie, et al., 1992
Hartland, Qin, et al., 1993
Garcia-Moreno and Moore, 1993
Qin, Hartland, et al., 1994
Chang, Wu, et al., 1994
Hartland, Qin, et al., 1995
Fockenberg, Marr, et al., 1998
Marr, Sears, et al., 1998
Kobayashi, Pride, et al., 2000
Kobayashi and Sears, 2001
Hall, Komissarov, et al., 2004
Kobayashi, Hall, et al., 2006


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 1 CH s-stretch 2806.01 ± 0.07 gas LF LD Feldman, Meier, et al., 1978
Petek, Nesbitt, et al., 1983
Hartland, Qin, et al., 1993
1 CH s-stretch 2806.01 ± 0.07 gas IR Petek, Nesbitt, et al., 1989
2 Bend 1352.6 gas AB LF Herzberg and Johns, 1966
Petek, Nesbitt, et al., 1987
Petek, Nesbitt, et al., 1987, 2
Hartland, Qin, et al., 1993
b2 3 CH a-stretch 2864.97 ± 0.02 gas LD IR Petek, Nesbitt, et al., 1983
Petek, Nesbitt, et al., 1989

State:   X


Vib. 
sym. 
 No.   Approximate 
 type of mode 
 cm-1   Med.   Method   References

a1 2 Bend 963.10 gas LMR DL Sears, Bunker, et al., 1981
Sears, Bunker, et al., 1982
McKellar, Yamada, et al., 1983
Marshall and McKellar, 1986
b2 3 CH2 a-stretch 3190 ± 5 gas IR Petek, Nesbitt, et al., 1989

Additional references: Jacox, 1994, page 18; Jacox, 1998, page 130; Jacox, 2003, page 16; Herzberg, 1961; Bernheim, Bernard, et al., 1970; Wasserman, Yager, et al., 1970; Wasserman, Kuck, et al., 1970; Herzberg and Johns, 1971; Mohlmann and DeHeer, 1976; Grimley and Stephenson, 1981; Ashfold, Fullstone, et al., 1982; Duxbury, 1982; Sears, Bunker, et al., 1982, 2; Jensen, Bunker, et al., 1982; Bunker, Sears, et al., 1983; Evenson, Sears, et al., 1984; Duxbury, 1988; Alijah and Duxbury, 1990; Garcia-Moreno, Lovejoy, et al., 1993; Xie and Dai, 1993; Ozeki and Saito, 1996; Michael, Lewen, et al., 2003; Brunken, Michael, et al., 2004; Brunken, Muller, et al., 2005

Notes

TTentative assignment or approximate value
oEnergy separation between the v = 0 levels of the excited and electronic ground states.

References

Go To: Top, Gas phase ion energetics data, Ion clustering data, Vibrational and/or electronic energy levels, Notes

Data compilation copyright by the U.S. Secretary of Commerce on behalf of the U.S.A. All rights reserved.

Leopold, Murray, et al., 1985
Leopold, D.G.; Murray, K.K.; Miller, A.E.S.; Lineberger, W.C., Methylene: A study of the X3B1 and the 1A1 states by photoelectron spectroscopy of CH2- and CD2-, J. Chem. Phys., 1985, 83, 4849. [all data]

Feldman, Rackwitz, et al., 1977
Feldman, D.; Rackwitz, R.; Kaiser, H.J.; Heincke, E., Photodetachment bei einigen neagtiven molekulionen: P2-, As2-, CH2-, CH3-, S3-, Z. Naturforsch. A:, 1977, 32, 600. [all data]

Engelking, Corderman, et al., 1981
Engelking, P.E.; Corderman, R.R.; Wenddoski, J.J.; Ellison, G.B.; O'Niel, V.S.; Lineberger, W.C., Laser photoelectron spectroscopy of CH2-, and the singlet-triplet splitting in methylene, J. Chem. Phys., 1981, 74, 5460. [all data]

Zittel, Ellison, et al., 1976
Zittel, P.F.; Ellison, G.B.; O'Neil, S.V.; Herbst, E.; Lineberger, W.C.; Reinhardt, W.P., Laser photoelectron spectrometry of CH2-. Singlet-triplet splitting and electron affinity of CH21, J. Am. Chem. Soc., 1976, 98, 3731. [all data]

Thynne and MacNiel, 1971
Thynne, J.C.J.; MacNiel, K.A.G., Negative ion formation by ethylene and 1,1-difluoroethylene, J. Phys. Chem., 1971, 75, 2584. [all data]

Reineke and Strein, 1976
Reineke, W.; Strein, K., Erzeugung eines methylenhaltigen Molekularstrahls durch Pyrolyse von Keten, Ber. Bunsen-Ges. Phys. Chem., 1976, 80, 343. [all data]

Niehaus, 1967
Niehaus, A., Anregung und Dissoziation von Molekulen beim Elektronenbeschuss. Messung der Bildungswahrscheinlichkeit fur neutrale Fragmente als Funktion der Elektronenenergie., Z. Naturforsch., 1967, 22a, 690. [all data]

Herzberg, 1961
Herzberg, G., The ionization potential of CH2, Can J. Phys., 1961, 39, 1511. [all data]

Kasdan, Herbst, et al., 1975
Kasdan, A.; Herbst, E.; Lineberger, W.C., Laser photoelectron spectrometry of CH2-, Chem. Phys. Lett., 1975, 31, 78. [all data]

Ellison, Engelking, et al., 1978
Ellison, G.B.; Engelking, P.C.; Lineberger, W.C., An experimental determination of the geometry and electron affinity of CH3, J. Am. Chem. Soc., 1978, 100, 2556. [all data]

Haynes and Armentrout, 1994
Haynes, C.L.; Armentrout, P.B., Thermochemistry and Structures of CoC3H6+: Metallacyclic and Metal-Alkene Isomers, Organomettalics, 1994, 13, 9, 3480, https://doi.org/10.1021/om00021a022 . [all data]

Georgiadis and Armentrout, 1989
Georgiadis, R.; Armentrout, P.B., Reactions of Ground State Cr+ with C2H6, C2H4, cyclo-C3H6, and cyclo-C2H4O: Bond Energies for CrCHn+ (n= 1-3), Int. J. Mass Spectrom. Ion Proc., 1989, 89, 2-3, 227, https://doi.org/10.1016/0168-1176(89)83062-9 . [all data]

Sunderlin and Armentrout, 1989
Sunderlin, L.S.; Armentrout, P.B., Periodic Trends in Chemical Reactivity: Reactions of Sc+, Y+, La+, and Lu+ with Methane and Ethane, J. Am. Chem. Soc., 1989, 111, 11, 3845, https://doi.org/10.1021/ja00193a015 . [all data]

Irikura, Johnson, et al., 1992
Irikura, K.K.; Johnson, R.D., III; Hudgens, J.W., Two new electronic states of methylene, J. Phys. Chem., 1992, 96, 15, 6131, https://doi.org/10.1021/j100194a010 . [all data]

Herzberg, 1961, 2
Herzberg, G., The Bakerian Lecture. The Spectra and Structures of Free Methyl and Free Methylene, Proc. Roy. Soc. (London) A262, 1961, 262, 1310, 291, https://doi.org/10.1098/rspa.1961.0120 . [all data]

Irikura and Hudgens, 1992
Irikura, K.K.; Hudgens, J.W., Detection of methylene (~X 3B1) radicals by 3 + 1 resonance-enhanced multiphoton ionization spectroscopy, J. Phys. Chem., 1992, 96, 2, 518, https://doi.org/10.1021/j100181a006 . [all data]

Herzberg and Johns, 1966
Herzberg, G.; Johns, J.W.C., The Spectrum and Structure of Singlet CH$_2$, Proc. Roy. Soc.(London) A295, 1966, 295, 1441, 107, https://doi.org/10.1098/rspa.1966.0229 . [all data]

Kim, Komissarov, et al., 2005
Kim, Y.; Komissarov, A.V.; Hall, G.E.; Sears, T.J., Observation of the c [sup 1]A[sub 1] state of methylene by optical-optical double resonance, J. Chem. Phys., 2005, 123, 2, 024306, https://doi.org/10.1063/1.1988289 . [all data]

Kim, Hall, et al., 2006
Kim, Y.; Hall, G.E.; Sears, T.J., Observation of the state of CH2 by optical--optical double resonance, J. Mol. Spectrosc., 2006, 240, 2, 269, https://doi.org/10.1016/j.jms.2006.10.008 . [all data]

McKellar, Bunker, et al., 1983
McKellar, A.R.W.; Bunker, P.R.; Sears, T.J.; Evenson, K.M.; Saykally, R.J.; Langhoff, S.R., Far infrared laser magnetic resonance of singlet methylene: Singlet--triplet perturbations, singlet--triplet transitions, and the singlet--triplet splittinga), J. Chem. Phys., 1983, 79, 11, 5251, https://doi.org/10.1063/1.445713 . [all data]

Petek, Nesbitt, et al., 1987
Petek, H.; Nesbitt, D.J.; Darwin, D.C.; Moore, C.B., Visible absorption and magnetic-rotation spectroscopy of 1CH2: The analysis of the b 1B1 state, J. Chem. Phys., 1987, 86, 3, 1172, https://doi.org/10.1063/1.452263 . [all data]

Green, Chen, et al., 1989
Green, W.H., Jr.; Chen, I.-C.; Bitto, H.; Guyer, D.R.; Moore, C.B., New vibrational bands of CH2 (), J. Mol. Spectrosc., 1989, 138, 2, 614, https://doi.org/10.1016/0022-2852(89)90022-2 . [all data]

Hartland, Xie, et al., 1992
Hartland, G.V.; Xie, W.; Qin, D.; Dai, H-L., Strong asymmetry induced ΔKa=3 transitions in the CH2 b 1B1→a 1A1 spectrum: A study by Fourier transform emission spectroscopy, J. Chem. Phys., 1992, 97, 9, 7010, https://doi.org/10.1063/1.463209 . [all data]

Hartland, Qin, et al., 1993
Hartland, G.V.; Qin, D.; Dai, H.-L., Fourier transform dispersed fluorescence spectroscopy: Observation of new vibrational levels in the 5000--8000 cm-1 region of a 1A1 CH2, J. Chem. Phys., 1993, 98, 3, 2469, https://doi.org/10.1063/1.464176 . [all data]

Garcia-Moreno and Moore, 1993
Garcia-Moreno, I.; Moore, C.B., Spectroscopy of methylene: Einstein coefficients for CH2(b 1B1--a 1A1) transitions, J. Chem. Phys., 1993, 99, 9, 6429, https://doi.org/10.1063/1.465882 . [all data]

Qin, Hartland, et al., 1994
Qin, D.; Hartland, G.V.; Dai, H.-L., A Characterization of the CH2ã1A1(1,2,0),(2,0,0),(0,5,0),(1,3,0) and b1B1(1,142,0),(0,180,0),(0,191,0) Vibronic Levels by Fourier-Transform Dispersed Fluorescence Spectroscopy, J. Mol. Spectrosc., 1994, 168, 2, 333, https://doi.org/10.1006/jmsp.1994.1282 . [all data]

Chang, Wu, et al., 1994
Chang, B.-C.; Wu, M.; Hall, G.E.; Sears, T.J., Near-infrared vibronic spectrum of the CH2 b 1B1←a 1A1 transition, J. Chem. Phys., 1994, 101, 11, 9236, https://doi.org/10.1063/1.468015 . [all data]

Fockenberg, Marr, et al., 1998
Fockenberg, C.; Marr, A.J.; Sears, T.J.; Chang, B.-C., Near-Infrared High Resolution Diode Laser Spectrum of the CH2←ã1A1Transition, J. Mol. Spectrosc., 1998, 187, 2, 119, https://doi.org/10.1006/jmsp.1997.7476 . [all data]

Marr, Sears, et al., 1998
Marr, A.J.; Sears, T.J.; Chang, B.-C., Near-infrared spectroscopy of CH[sub 2] by frequency modulated diode laser absorption, J. Chem. Phys., 1998, 109, 9, 3431, https://doi.org/10.1063/1.476938 . [all data]

Kobayashi, Pride, et al., 2000
Kobayashi, K.; Pride, L.D.; Sears, T.J., Absorption Spectroscopy of Singlet CH, J. Phys. Chem. A, 2000, 104, 45, 10119, https://doi.org/10.1021/jp000293i . [all data]

Kobayashi and Sears, 2001
Kobayashi, K.; Sears, T.J., Can. J. Phys., 2001, 79, 347. [all data]

Hall, Komissarov, et al., 2004
Hall, G.E.; Komissarov, A.V.; Sears, T.J., Doppler-Resolved Spectroscopy as an Assignment Tool in the Spectrum of Singlet Methylene, J. Phys. Chem. A, 2004, 108, 39, 7922, https://doi.org/10.1021/jp0494133 . [all data]

Kobayashi, Hall, et al., 2006
Kobayashi, K.; Hall, G.E.; Sears, T.J., The spectrum of CH[sub 2] near 1.36 and 0.92 μm: Reevaluation of rotational level structure and perturbations in a(010), J. Chem. Phys., 2006, 124, 18, 184320, https://doi.org/10.1063/1.2200340 . [all data]

Chang, Wang, et al., 2011
Chang, C.-H.; Wang, Z.; Hall, G.E.; Sears, T.J.; Xin, J., Transient laser absorption spectroscopy of CH2 near 780nm, J. Mol. Spectrosc., 2011, 267, 1-2, 50, https://doi.org/10.1016/j.jms.2011.02.004 . [all data]

Chang, Xin, et al., 2011
Chang, C.-H.; Xin, J.; Latsha, T.; Otruba, E.; Wang, Z.; Hall, G.E.; Sears, T.J.; Chang, B.-C., CH, J. Phys. Chem. A, 2011, 115, 34, 9440, https://doi.org/10.1021/jp1115965 . [all data]

Bunker and Sears, 1985
Bunker, P.R.; Sears, T.J., Analysis of the laser photoelectron spectrum of CH-2, J. Chem. Phys., 1985, 83, 10, 4866, https://doi.org/10.1063/1.449747 . [all data]

Bunker, Jensen, et al., 1986
Bunker, P.R.; Jensen, P.; Kraemer, W.P.; Beardsworth, R., The potential surface of X 3B1 methylene (CH2) and the singlet--triplet splitting, J. Chem. Phys., 1986, 85, 7, 3724, https://doi.org/10.1063/1.450944 . [all data]

Petek, Nesbitt, et al., 1987, 2
Petek, H.; Nesbitt, D.J.; Moore, C.B.; Birss, F.W.; Ramsay, D.A., Visible absorption and magnetic-rotation spectroscopy of 1CH2: Analysis of the 1A1 state and the 1A1--3B1 coupling, J. Chem. Phys., 1987, 86, 3, 1189, https://doi.org/10.1063/1.452264 . [all data]

Jensen and Bunker, 1988
Jensen, P.; Bunker, P.R., The potential surface and stretching frequencies of X 3B1 methylene (CH2) determined from experiment using the Morse oscillator-rigid bender internal dynamics Hamiltonian, J. Chem. Phys., 1988, 89, 3, 1327, https://doi.org/10.1063/1.455184 . [all data]

Xie, Harkin, et al., 1989
Xie, W.; Harkin, C.; Dai, H.L.; Green, W.H., Jr.; Zheng, Q.K.; Mahoney, A.J., Transient vibrational spectroscopy of, J. Mol. Spectrosc., 1989, 138, 2, 596, https://doi.org/10.1016/0022-2852(89)90020-9 . [all data]

Xie, Harkin, et al., 1990
Xie, W.; Harkin, C.; Dai, H.-L., Bending overtones and barrier height of a 1A1 CH2 by flash photolysis stimulated emission pumping, J. Chem. Phys., 1990, 93, 7, 4615, https://doi.org/10.1063/1.458701 . [all data]

Hartland, Qin, et al., 1995
Hartland, G.V.; Qin, D.; Dai, H.-L., Renner--Teller effect on the highly excited bending levels of a 1A1 CH2, J. Chem. Phys., 1995, 102, 17, 6641, https://doi.org/10.1063/1.469136 . [all data]

Feldman, Meier, et al., 1978
Feldman, D.; Meier, K.; Schmiedl, R.; Welge, K.H., Laser induced fluorescence spectrum of singlet methylene. Spectroscopy of the a~1A1 state, Chem. Phys. Lett., 1978, 60, 1, 30, https://doi.org/10.1016/0009-2614(78)85703-0 . [all data]

Petek, Nesbitt, et al., 1983
Petek, H.; Nesbitt, D.J.; Ogilby, P.R.; Moore, C.B., Infrared flash kinetic spectroscopy: the .nu.1 and .nu.3 spectra of singlet methylene, J. Phys. Chem., 1983, 87, 26, 5367, https://doi.org/10.1021/j150644a012 . [all data]

Petek, Nesbitt, et al., 1989
Petek, H.; Nesbitt, D.J.; Darwin, D.C.; Ogilby, P.R.; Moore, C.B.; Ramsay, D.A., Analysis of CH2 a 1A1 (1,0,0) and (0,0,1) Coriolis-coupled states, a 1A1--X 3B1 spin--orbit coupling, and the equilibrium structure of CH2 a 1A1 state, J. Chem. Phys., 1989, 91, 11, 6566, https://doi.org/10.1063/1.457375 . [all data]

Sears, Bunker, et al., 1981
Sears, T.J.; Bunker, P.R.; McKellar, A.R.W., Observation of the ν2 band of CH2 by laser magnetic resonance, J. Chem. Phys., 1981, 75, 9, 4731, https://doi.org/10.1063/1.442592 . [all data]

Sears, Bunker, et al., 1982
Sears, T.J.; Bunker, P.R.; McKellar, A.R.W., The laser magnetic resonance spectrum of the ν2 band of the methylene radical CH2, J. Chem. Phys., 1982, 77, 11, 5363, https://doi.org/10.1063/1.443784 . [all data]

McKellar, Yamada, et al., 1983
McKellar, A.R.W.; Yamada, C.; Hirota, E., Detection of the ν2 bands of CD2 and CH2 by infrared diode laser spectroscopy, J. Chem. Phys., 1983, 79, 3, 1220, https://doi.org/10.1063/1.445926 . [all data]

Marshall and McKellar, 1986
Marshall, M.D.; McKellar, A.R.W., The ν2 fundamental band of triplet CH2, J. Chem. Phys., 1986, 85, 7, 3716, https://doi.org/10.1063/1.450943 . [all data]

Jacox, 1994
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules, American Chemical Society, Washington, DC, 1994, 464. [all data]

Jacox, 1998
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement A, J. Phys. Chem. Ref. Data, 1998, 27, 2, 115-393, https://doi.org/10.1063/1.556017 . [all data]

Jacox, 2003
Jacox, M.E., Vibrational and electronic energy levels of polyatomic transient molecules: supplement B, J. Phys. Chem. Ref. Data, 2003, 32, 1, 1-441, https://doi.org/10.1063/1.1497629 . [all data]

Bernheim, Bernard, et al., 1970
Bernheim, R.A.; Bernard, H.W.; Wang, P.S.; Wood, L.S.; Skell, P.S., Electron Paramagnetic Resonance of Triplet CH2, J. Chem. Phys., 1970, 53, 3, 1280, https://doi.org/10.1063/1.1674129 . [all data]

Wasserman, Yager, et al., 1970
Wasserman, E.; Yager, W.A.; Kuck, V.J., EPR of CH2: a substiantially bent and partially rotating ground state triplet, Chem. Phys. Lett., 1970, 7, 4, 409, https://doi.org/10.1016/0009-2614(70)80320-7 . [all data]

Wasserman, Kuck, et al., 1970
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Notes

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