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Methylene

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Gas phase thermochemistry data

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

Quantity Value Units Method Reference Comment
Deltafgas386.39kJ/molReviewChase, 1998Data last reviewed in December, 1972
Quantity Value Units Method Reference Comment
gas,1 bar193.93J/mol*KReviewChase, 1998Data last reviewed in December, 1972

Gas Phase Heat Capacity (Shomate Equation)

Cp° = A + B*t + C*t2 + D*t3 + E/t2
H° − H°298.15= A*t + B*t2/2 + C*t3/3 + D*t4/4 − E/t + F − H
S° = A*ln(t) + B*t + C*t2/2 + D*t3/3 − E/(2*t2) + G
    Cp = heat capacity (J/mol*K)
    H° = standard enthalpy (kJ/mol)
    S° = standard entropy (J/mol*K)
    t = temperature (K) / 1000.

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Temperature (K) 298. - 1400.1400. - 6000.
A 31.9682351.55901
B 6.7836033.876975
C 12.51890-0.649608
D -5.6962650.037901
E -0.031115-10.72589
F 376.3558350.6715
G 229.9150232.3212
H 386.3924386.3924
ReferenceChase, 1998Chase, 1998
Comment Data last reviewed in December, 1972 Data last reviewed in December, 1972

Reaction thermochemistry data

Go To: Top, Gas phase thermochemistry 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. A general reaction search form is also available. Future versions of this site may rely on reaction search pages in place of the enumerated reaction displays seen below.

Individual Reactions

(CAS Reg. No. 60291-30-7 bullet 4294967295Methylene) + Methylene = CAS Reg. No. 60291-30-7

By formula: (CAS Reg. No. 60291-30-7 bullet 4294967295CH2) + CH2 = CAS Reg. No. 60291-30-7

Quantity Value Units Method Reference Comment
Deltar88.3 ± 6.7kJ/molCIDTPoutsma, Nash, et al., 1997gas phase; B
Deltar91. ± 13.kJ/molTherHierl, Henchman, et al., 1992gas phase; HO- + MeBr:6.0±2.3 kcal/mol endo. "Better than Ingemann and Nibbering, 19852" 2.0 kcal would not show barrier; B
Deltar102. ± 27.kJ/molTherIngemann and Nibbering, 1985, 2gas phase; B

(CAS Reg. No. 60291-29-4 bullet 4294967295Methylene) + Methylene = CAS Reg. No. 60291-29-4

By formula: (CAS Reg. No. 60291-29-4 bullet 4294967295CH2) + CH2 = CAS Reg. No. 60291-29-4

Quantity Value Units Method Reference Comment
Deltar119. ± 13.kJ/molN/AIngemann and Nibbering, 1985, 2gas phase; B
Deltar97. ± 12.kJ/molCIDTPoutsma, Nash, et al., 1997gas phase; B

CH- + Hydrogen cation = Methylene

By formula: CH- + H+ = CH2

Quantity Value Units Method Reference Comment
Deltar1615.2 ± 1.8kJ/molD-EAKasdan, Herbst, et al., 1975gas phase; B
Quantity Value Units Method Reference Comment
Deltar1586.9 ± 2.2kJ/molH-TSKasdan, Herbst, et al., 1975gas phase; B

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

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

Quantity Value Units Method Reference Comment
Deltar397.4 ± 3.3kJ/molN/AEllison, Engelking, et al., 1978gas phase; B

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

By formula: La+ + CH2 = (La+ bullet CH2)

Quantity Value Units Method Reference Comment
Deltar411. ± 5.9kJ/molCIDTSunderlin and Armentrout, 1989RCD

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

By formula: Sc+ + CH2 = (Sc+ bullet CH2)

Quantity Value Units Method Reference Comment
Deltar411. ± 22.kJ/molCIDTSunderlin and Armentrout, 1989RCD

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

By formula: Y+ + CH2 = (Y+ bullet CH2)

Quantity Value Units Method Reference Comment
Deltar398. ± 13.kJ/molCIDTSunderlin and Armentrout, 1989RCD

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

By formula: Co+ + CH2 = (Co+ bullet CH2)

Quantity Value Units Method Reference Comment
Deltar318. ± 5.0kJ/molCIDTHaynes and Armentrout, 1994RCD

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

By formula: Cr+ + CH2 = (Cr+ bullet CH2)

Quantity Value Units Method Reference Comment
Deltar225. ± 7.9kJ/molCIDTGeorgiadis and Armentrout, 1989RCD

Vibrational and/or electronic energy levels

Go To: Top, Gas phase thermochemistry data, Reaction thermochemistry 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   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

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

State:   D


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

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

State:   C


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

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

State:   3d 3A2


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

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

State:   3p


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

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

State:   c


 Energy 
 (cm-1
 Med.   Transition   «lambda»min 
 (nm) 
 «lambda»max 
 (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   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 11497 ± 10 gas b-a 465 1400 Herzberg, 1961
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   «lambda»min 
 (nm) 
 «lambda»max 
 (nm) 
 References

To = 3147 ± 5 gas b-a 465 1400 Herzberg, 1961
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, 2; 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 thermochemistry data, Reaction thermochemistry 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.

Chase, 1998
Chase, M.W., Jr., NIST-JANAF Themochemical Tables, Fourth Edition, J. Phys. Chem. Ref. Data, Monograph 9, 1998, 1-1951. [all data]

Poutsma, Nash, et al., 1997
Poutsma, J.C.; Nash, J.J.; Paulino, J.A.; Squires, R.R., Absolute Heats of Formation of Phenylcarbene and Vinylcarbene, J. Am. Chem. Soc., 1997, 119, 20, 4686, https://doi.org/10.1021/ja963918s . [all data]

Hierl, Henchman, et al., 1992
Hierl, P.M.; Henchman, M.J.; Paulson, J.F., Threshold Energies for the Reactions HO- + MeX - MeOH + X- measured by Tandem Mass Spectrometry: Acidities of MeCl and MeBr, Int. J. Mass Spectrom. Ion Proc., 1992, 117, 475, https://doi.org/10.1016/0168-1176(92)80109-E . [all data]

Ingemann and Nibbering, 1985
Ingemann, S.; Nibbering, N.M.M., Gas phase chemistry of alpha-thio carbanions, Can. J. Chem., 1985, 62, 2273. [all data]

Ingemann and Nibbering, 1985, 2
Ingemann, S.; Nibbering, N.M.M., Gas-phase acidity of CH3X [X = P(CH3)2, SCH3, F, Cl, Br, I] compounds, J. Chem. Soc. Perkin Trans. 2, 1985, 837. [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]

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]

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]

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
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 «DELTA»Ka=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 «mu»m: 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]

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]

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 «nu»2 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 «nu»2 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 «nu»2 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 «nu»2 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
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Notes

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