H2CSi

Formula: CH₂Si
Molecular weight: 42.1121
CAS Registry Number: 65632-07-7
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Vibrational and/or electronic energy levels

State: B

Energy (cm^-1)	Med.	Transition	λ_min (nm)	λ_max (nm)	References


T_o = 29312.88	gas	B-X	300	342	Leclercq and Dubois, 1979
					Harper, Ferrall, et al., 1997
					Harper, Waddell, et al., 1997
					Hostutler, Smith, et al., 1999

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


a₁	1	CH₂ stretch	2997	gas	LF	Harper, Waddell, et al., 1997 Hostutler, Smith, et al., 1999
	2	CH₂ scissors	1101.96	gas	AB LF	Leclercq and Dubois, 1979 Harper, Waddell, et al., 1997 Hostutler, Smith, et al., 1999
	3	CSi stretch	702.00	gas	AB LF	Leclercq and Dubois, 1979 Harper, Ferrall, et al., 1997 Harper, Waddell, et al., 1997 Hostutler, Smith, et al., 1999
b₁	4	OPLA	697	gas	LF	Hostutler, Smith, et al., 1999
b₂	6	CH₂ rock	731	gas	LF	Harper, Waddell, et al., 1997 Hostutler, Smith, et al., 1999

State: A

Energy (cm^-1)	Med.	References


T_o = 15132.97	gas	Smith, Evans, et al., 2003

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


a₁	2	CH₂ scissors	1288	gas	SEP	Smith, Evans, et al., 2003
	3	CSi stretch	717	gas	SEP	Smith, Evans, et al., 2003
b₁	4	OPLA	661	gas	SEP	Smith, Evans, et al., 2003
b₂	6	CH₂ rock	672	gas	SEP	Smith, Evans, et al., 2003

State: X

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


a₁	1	CH₂ s-stretch	2947 ± 5		gas	LF	Smith, Li, et al., 2001
	2	CH₂ scissors	1273 ± 3		gas	SEP	Smith, Li, et al., 2001
	3	CSi stretch	933 ± 3		gas	SEP	Smith, Li, et al., 2001
b₁	4	OPLA	687 ± 5	H	gas	SEP	Smith, Li, et al., 2001
b₂	6	CH₂ rock	263 ± 5		gas	LF	Smith, Li, et al., 2001

Additional references: Jacox, 1994, page 138; Jacox, 1998, page 223; Jacox, 2003, page 169; Izuha, Yamamoto, et al., 1996

Notes

(1/2)(2ν)

Energy separation between the v = 0 levels of the excited and electronic ground states.

References

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Leclercq and Dubois, 1979
Leclercq, H.; Dubois, I., The absorption spectrum of the H2CSi radical, J. Mol. Spectrosc., 1979, 76, 1-3, 39, https://doi.org/10.1016/0022-2852(79)90216-9 . [all data]

Harper, Ferrall, et al., 1997
Harper, W.W.; Ferrall, E.A.; Hilliard, R.K.; Stogner, S.M.; Grev, R.S.; Clouthier, D.J., Laser Spectroscopic Detection of the Simplest Unsaturated Silylene and Germylene, J. Am. Chem. Soc., 1997, 119, 35, 8361, https://doi.org/10.1021/ja9716012 . [all data]

Harper, Waddell, et al., 1997
Harper, W.W.; Waddell, K.W.; Clouthier, D.J., Jet spectroscopy, structure, anomalous fluorescence, and molecular quantum beats of silylidene (H[sub 2]C=Si), the simplest unsaturated silylene, J. Chem. Phys., 1997, 107, 21, 8829, https://doi.org/10.1063/1.475175 . [all data]

Hostutler, Smith, et al., 1999
Hostutler, D.A.; Smith, T.C.; Li, H.; Clouthier, D.J., The electronic spectrum, molecular structure, and oscillatory fluorescence decay of jet-cooled germylidene (H[sub 2]C[Double Bond][sup 74]Ge), the simplest unsaturated germylene, J. Chem. Phys., 1999, 111, 3, 950, https://doi.org/10.1063/1.479187 . [all data]

Smith, Evans, et al., 2003
Smith, T.C.; Evans, C.J.; Clouthier, D.J., Discovery of the optically forbidden S[sub 1]--S[sub 0] transition of silylidene (H[sub 2]C[Double Bond]Si), J. Chem. Phys., 2003, 118, 4, 1642, https://doi.org/10.1063/1.1531618 . [all data]

Smith, Li, et al., 2001
Smith, T.C.; Li, H.; Clouthier, D.J., The ground state of silylidene (H[sub 2]C=Si), the silicon analog of vinylidene, from stimulated emission pumping and wavelength-resolved fluorescence spectroscopy, J. Chem. Phys., 2001, 114, 20, 9012, https://doi.org/10.1063/1.1368384 . [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]

Izuha, Yamamoto, et al., 1996
Izuha, M.; Yamamoto, S.; Saito, S., Microwave spectrum of silylidene H2CSi, J. Chem. Phys., 1996, 105, 12, 4923, https://doi.org/10.1063/1.472343 . [all data]

Notes

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Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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