Methoxy radical
- Formula: CH3O
- Molecular weight: 31.0339
- IUPAC Standard InChIKey: GRVDJDISBSALJP-UHFFFAOYSA-N
- CAS Registry Number: 2143-68-2
- Chemical structure:
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Vibrational and/or electronic energy levels
Go To: Top, 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: A
Energy (cm-1) |
Med. | Transition | λmin (nm) |
λmax (nm) |
References | ||
---|---|---|---|---|---|---|---|
To = 31644.2 | gas | A-X | 271 | 421 | Style and Ward, 1953 | ||
Ohbayashi, Akimoto, et al., 1977 | |||||||
Wendt and Hunziker, 1979 | |||||||
Inoue, Akimoto, et al., 1980 | |||||||
Powers, Hopkins, et al., 1981 | |||||||
Carrick, Brossard, et al., 1985 | |||||||
Brossard, Carrick, et al., 1986 | |||||||
Garland, 1988 | |||||||
Foster, Misra, et al., 1988 | |||||||
Liu, Damo, et al., 1989 | |||||||
Kappert and Temps, 1989 | |||||||
Liu, Foster, et al., 1990 | |||||||
Lee, Wann, et al., 1993 | |||||||
Geers, Kappert, et al., 1994 | |||||||
Osborn, Leahy, et al., 1995 | |||||||
Powers, Pushkarsky, et al., 1997 | |||||||
Liu, Chen, et al., 2009 | |||||||
To = 31291 ± 3 | Ar | A-X | 270 | 420 | Chiang, Hsu, et al., 1989 | ||
Vib. sym. |
No. | Approximate type of mode |
cm-1 | Med. | Method | References | |
---|---|---|---|---|---|---|---|
a1 | 1 | CH3 stretch | 2947.8 | gas | LF | Powers, Pushkarsky, et al., 1997 | |
2 | Umbrella | 1289.3 | gas | LF | Foster, Misra, et al., 1988 Lee, Wann, et al., 1993 Powers, Pushkarsky, et al., 1997 | ||
2 | Umbrella | 1308 ± 4 | Ar | LF | Chiang, Hsu, et al., 1989 | ||
3 | CO stretch | 662.4 | gas | AB EM | Wendt and Hunziker, 1979 Brossard, Carrick, et al., 1986 | ||
3 | CO stretch | 662.4 | gas | LF | Foster, Misra, et al., 1988 Powers, Pushkarsky, et al., 1997 | ||
3 | CO stretch | 657 ± 2 | Ar | LF | Chiang, Hsu, et al., 1989 | ||
e | 4 | CH3 stretch | 3077.8 | T | gas | LF | Powers, Pushkarsky, et al., 1997 |
5 | CH2 scissors | 1403.0 | gas | LF | Foster, Misra, et al., 1988 Powers, Pushkarsky, et al., 1997 | ||
5 | CH2 scissors | 1410 ± 3 | Ar | LF | Chiang, Hsu, et al., 1989 | ||
6 | HCO deform. | 929.5 | gas | LF | Powers, Pushkarsky, et al., 1997 | ||
State: X
Additional references: Jacox, 1994, page 236; Jacox, 1998, page 271; Jacox, 2003, page 257; Radford and Russell, 1977; Inoue, Akimoto, et al., 1979; Russell and Radford, 1980; Endo, Saito, et al., 1984; Fuke, Ozawa, et al., 1986; Agrawalla and Setser, 1986; Wantuck, Oldenborg, et al., 1987; Lin, Lee, et al., 1988; Momose, Endo, et al., 1988; Suto, Ye, et al., 1988; Geers, Kappert, et al., 1990; Powers, Pushkarsky, et al., 1997, 2; Applegate, Pushkarsky, et al., 1999; Liu, Chen, et al., 2009, 2
Notes
T | Tentative assignment or approximate value |
o | Energy separation between the v = 0 levels of the excited and electronic ground states. |
References
Go To: Top, 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.
Style and Ward, 1953
Style, D.W.G.; Ward, J.C.,
Fluorescent spectra from ethyl nitrate. Part 1.?Supposed emissions from alkoxy radicals and NO2,
Trans. Faraday Soc., 1953, 49, 999, https://doi.org/10.1039/tf9534900999
. [all data]
Ohbayashi, Akimoto, et al., 1977
Ohbayashi, K.; Akimoto, H.; Tanaka, I.,
Emission spectra of methoxyl, ethoxyl, and isopropoxyl radicals,
J. Phys. Chem., 1977, 81, 8, 798, https://doi.org/10.1021/j100523a023
. [all data]
Wendt and Hunziker, 1979
Wendt, H.R.; Hunziker, H.E.,
Electronic absorption spectrum of CH3O,
J. Chem. Phys., 1979, 71, 12, 5202, https://doi.org/10.1063/1.438296
. [all data]
Inoue, Akimoto, et al., 1980
Inoue, G.; Akimoto, H.; Okuda, M.,
Spectroscopy of the CH3O A 2A1--X 2E system by laser-excited fluorescence method,
J. Chem. Phys., 1980, 72, 3, 1769, https://doi.org/10.1063/1.439291
. [all data]
Powers, Hopkins, et al., 1981
Powers, E.; Hopkins, J.B.; Smalley, R.E.,
Laser production of jet-cooled radicals. Methoxy and methoxy-argon,
J. Phys. Chem., 1981, 85, 19, 2711, https://doi.org/10.1021/j150619a003
. [all data]
Carrick, Brossard, et al., 1985
Carrick, P.G.; Brossard, S.D.; Engelking, P.C.,
Experimental observation of the spin-orbit splitting in methoxy,
J. Chem. Phys., 1985, 83, 4, 1995, https://doi.org/10.1063/1.449338
. [all data]
Brossard, Carrick, et al., 1986
Brossard, S.D.; Carrick, P.G.; Chappell, E.L.; Hulegaard, S.C.; Engelking, P.C.,
The 2A1--2E electronic spectrum of methoxy, CH3O: Vibrational progressions, and spin-orbit and Jahn--Teller couplings,
J. Chem. Phys., 1986, 84, 5, 2459, https://doi.org/10.1063/1.450364
. [all data]
Garland, 1988
Garland, N.L.,
and D. R. Crosley, 1988, J. Phys. Chem. 92, 5322. [all data]
Foster, Misra, et al., 1988
Foster, S.C.; Misra, P.; Lin, T.-Y.; Damo, C.P.; Carter, C.C.; Miller, T.A.,
Free jet-cooled laser-induced fluorescence spectrum of methoxy. 1. Vibronic analysis of the ~A and ~X states,
J. Phys. Chem., 1988, 92, 21, 5914, https://doi.org/10.1021/j100332a014
. [all data]
Liu, Damo, et al., 1989
Liu, X.; Damo, C.P.; Lin, T.-Y.D.; Foster, S.C.; Misra, P.; Yu, L.; Miller, T.A.,
Free jet-cooled laser-induced fluorescence spectrum of methoxy radical. 2. Rotational analysis of the ~A2A1 .tautm. ~X2E electronic transition,
J. Phys. Chem., 1989, 93, 6, 2266, https://doi.org/10.1021/j100343a016
. [all data]
Kappert and Temps, 1989
Kappert, J.; Temps, F.,
Rotationally resolved laser-induced fluorescence excitation studies of CH3O,
Chem. Phys., 1989, 132, 1-2, 197, https://doi.org/10.1016/0301-0104(89)80088-6
. [all data]
Liu, Foster, et al., 1990
Liu, X.; Foster, S.C.; Williamson, J.M.; Yu, L.; Miller, T.A.,
The spin-rotation interactions in the methoxy radical,
Mol. Phys., 1990, 69, 2, 357, https://doi.org/10.1080/00268979000100251
. [all data]
Lee, Wann, et al., 1993
Lee, Y.-Y.; Wann, G.-H.; Lee, Y.-P.,
Vibronic analysis of the A→X laser-induced fluorescence of jet-cooled methoxy (CH3O) radical,
J. Chem. Phys., 1993, 99, 12, 9465, https://doi.org/10.1063/1.465481
. [all data]
Geers, Kappert, et al., 1994
Geers, A.; Kappert, J.; Temps, F.; Wiebrecht, J.W.,
Rotation--vibration state resolved unimolecular dynamics of highly vibrationally excited CH3O (X 2E). I. Observed stimulated emission pumping spectra,
J. Chem. Phys., 1994, 101, 5, 3618, https://doi.org/10.1063/1.467547
. [all data]
Osborn, Leahy, et al., 1995
Osborn, D.L.; Leahy, D.J.; Ross, E.M.; Neumark, D.M.,
Study of the predissociation of by fast beam photofragment translational spectroscopy,
Chem. Phys. Lett., 1995, 235, 5-6, 484, https://doi.org/10.1016/0009-2614(95)00151-S
. [all data]
Powers, Pushkarsky, et al., 1997
Powers, D.E.; Pushkarsky, M.B.; Miller, T.A.,
Rovibronic analysis of the laser induced fluorescence excitation spectrum of the jet-cooled methoxy radical,
J. Chem. Phys., 1997, 106, 17, 6863, https://doi.org/10.1063/1.473712
. [all data]
Liu, Chen, et al., 2009
Liu, J.; Chen, M.-W.; Melnik, D.; Yi, J.T.; Miller, T.A.,
The spectroscopic characterization of the methoxy radical. I. Rotationally resolved A [sup 2]A[sub 1]--X [sup 2]E electronic spectra of CH[sub 3]O,
J. Chem. Phys., 2009, 130, 7, 074302, https://doi.org/10.1063/1.3072104
. [all data]
Chiang, Hsu, et al., 1989
Chiang, S.-Y.; Hsu, Y.-C.; Lee, Y.-P.,
Laser-induced emission of CH3O in solid argon,
J. Chem. Phys., 1989, 90, 1, 81, https://doi.org/10.1063/1.456471
. [all data]
Temps, 1995
Temps, F.,
VIBRATIONAL SPECTROSCOPY, INTRAMOLECULAR DYNAMICS AND STATE SPECIFIC UNIMOLECULAR DISSOCIATION OF,
Adv. Ser. Phys. Chem., 1995, 4, 375. [all data]
Nee, Osterwalder, et al., 2006
Nee, M.J.; Osterwalder, A.; Zhou, J.; Neumark, D.M.,
Slow electron velocity-map imaging photoelectron spectra of the methoxide anion,
J. Chem. Phys., 2006, 125, 1, 014306, https://doi.org/10.1063/1.2212411
. [all data]
Ebata, Yanagishita, et al., 1982
Ebata, T.; Yanagishita, H.; Obi, K.; Tanaka, I.,
Ã→X fluorescence spectra of CH3O and C2H5O generated by the Arf laser photolysis of alkyl nitrites,
Chem. Phys., 1982, 69, 1-2, 27, https://doi.org/10.1016/0301-0104(82)88129-9
. [all data]
Han, Utkin, et al., 2002
Han, J.-X.; Utkin, Yu.G.; Chen, H.-B.; Burns, L.A.; Curl, R.F.,
High-resolution infrared spectra of the C-H asymmetric stretch vibration of jet-cooled methoxy radical (CH[sub 3]O),
J. Chem. Phys., 2002, 117, 14, 6538, https://doi.org/10.1063/1.1507116
. [all data]
Han, Hu, et al., 2007
Han, J.; Hu, S.; Chen, H.; Utkin, Y.; Brown, J.M.; Curl, R.F.,
Jet-cooled infrared spectrum of methoxy in the CH stretching region,
Phys. Chem. Chem. Phys., 2007, 9, 28, 3725, https://doi.org/10.1039/b700502d
. [all data]
Osborn, Leahy, et al., 1998
Osborn, D.L.; Leahy, D.J.; Kim, E.H.; de Beer, E.; Neumark, D.M.,
Photoelectron spectroscopy of CH3O- and CD3O-,
Chem. Phys. Lett., 1998, 292, 4-6, 651, https://doi.org/10.1016/S0009-2614(98)00717-9
. [all data]
Ramond, Davico, et al., 2000
Ramond, T.M.; Davico, G.E.; Schwartz, R.L.; Lineberger, W.C.,
Vibronic structure of alkoxy radicals via photoelectron spectroscopy,
J. Chem. Phys., 2000, 112, 3, 1158, https://doi.org/10.1063/1.480767
. [all data]
Geers, Kappert, et al., 1993
Geers, A.; Kappert, J.; Temps, F.; Sears, T.J.,
Stimulated emission pumping spectroscopy of CH3O (X 2E, ν6): New observations on the Jahn--Teller effect,
J. Chem. Phys., 1993, 98, 5, 4297, https://doi.org/10.1063/1.465036
. [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]
Radford and Russell, 1977
Radford, H.E.; Russell, D.K.,
Spectroscopic detection of methoxy (CH3O),
J. Chem. Phys., 1977, 66, 5, 2222, https://doi.org/10.1063/1.434142
. [all data]
Inoue, Akimoto, et al., 1979
Inoue, G.; Akimoto, H.; Okuda, M.,
Laser-induced fluorescence spectra of CH3O,
Chem. Phys. Lett., 1979, 63, 2, 213, https://doi.org/10.1016/0009-2614(79)87002-5
. [all data]
Russell and Radford, 1980
Russell, D.K.; Radford, H.E.,
Analysis of the LMR spectra of methoxy, CH3O,
J. Chem. Phys., 1980, 72, 4, 2750, https://doi.org/10.1063/1.439423
. [all data]
Endo, Saito, et al., 1984
Endo, Y.; Saito, S.; Hirota, E.,
The microwave spectrum of the methoxy radical CH3O,
J. Chem. Phys., 1984, 81, 1, 122, https://doi.org/10.1063/1.447375
. [all data]
Fuke, Ozawa, et al., 1986
Fuke, K.; Ozawa, K.; Kaya, K.,
Electronic spectra and predissociation of jet-cooled CH3O and CH3O-Ar in the Ã2A1 state,
Chem. Phys. Lett., 1986, 126, 2, 119, https://doi.org/10.1016/S0009-2614(86)80023-9
. [all data]
Agrawalla and Setser, 1986
Agrawalla, B.S.; Setser, D.W.,
Infrared chemiluminescence and laser-induced fluorescence studies of energy disposal by reactions of fluorine and chlorine atoms with hydrogen sulfide, deuterium sulfide, hydrogen selenide, water, water-d2, and methanol,
J. Phys. Chem., 1986, 90, 11, 2450, https://doi.org/10.1021/j100402a039
. [all data]
Wantuck, Oldenborg, et al., 1987
Wantuck, P.J.; Oldenborg, R.C.; Baughcum, S.L.; Winn, K.R.,
Collisional quenching of methoxy(A2A1) radical,
J. Phys. Chem., 1987, 91, 12, 3253, https://doi.org/10.1021/j100296a030
. [all data]
Lin, Lee, et al., 1988
Lin, S.-R.; Lee, Y.-P.; Nee, J.B.,
Radiative lifetime and quenching of the A 2A1 state of the CH3O radical,
J. Chem. Phys., 1988, 88, 1, 171, https://doi.org/10.1063/1.454633
. [all data]
Momose, Endo, et al., 1988
Momose, T.; Endo, Y.; Hirota, E.; Shida, T.,
The submillimeter-wave spectrum of the 13CH3O radical,
J. Chem. Phys., 1988, 88, 9, 5338, https://doi.org/10.1063/1.454593
. [all data]
Suto, Ye, et al., 1988
Suto, M.; Ye, C.; Lee, L.C.,
CH3O(A--X) fluorescence from photodissociation of dimethyl ether,
J. Chem. Phys., 1988, 89, 10, 6555, https://doi.org/10.1063/1.455378
. [all data]
Geers, Kappert, et al., 1990
Geers, A.; Kappert, J.; Temps, F.; Wiebrecht, J.W.,
Stimulated-emission pumping spectroscopy of highly excited states of CH_3O (X~ ^2E): zero-order vibrational states at 3000 cm^-1 ≤ 9000 cm^-1,
J. Opt. Soc. Am. B, 1990, 7, 9, 1935, https://doi.org/10.1364/JOSAB.7.001935
. [all data]
Powers, Pushkarsky, et al., 1997, 2
Powers, D.E.; Pushkarsky, M.B.; Miller, T.A.,
Vibrational mode and frequency dependence of the photofragmentation of the methoxy radical,
J. Chem. Phys., 1997, 106, 17, 6878, https://doi.org/10.1063/1.473713
. [all data]
Applegate, Pushkarsky, et al., 1999
Applegate, B.E.; Pushkarsky, M.B.; Miller, T.A.,
Spectral Analysis and Photofragmentation Dynamics of the Perdeuteromethoxy Radical,
J. Phys. Chem. A, 1999, 103, 11, 1538, https://doi.org/10.1021/jp984141n
. [all data]
Liu, Chen, et al., 2009, 2
Liu, J.; Chen, M.-W.; Melnik, D.; Miller, T.A.; Endo, Y.; Hirota, E.,
The spectroscopic characterization of the methoxy radical. II. Rotationally resolved A [sup 2]A[sub 1]-X [sup 2]E electronic and X [sup 2]E microwave spectra of the perdeuteromethoxy radical CD[sub 3]O,
J. Chem. Phys., 2009, 130, 7, 074303, https://doi.org/10.1063/1.3072105
. [all data]
Notes
Go To: Top, Vibrational and/or electronic energy levels, References
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