H2CSi

Formula: CH₂Si
Molecular weight: 42.1121
CAS Registry Number: 65632-07-7
Information on this page:
Data at other public NIST sites:
- Gas Phase Kinetics Database
Options:
- Switch to SI units

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

Go To: Top, Vibrational and/or electronic energy levels, Notes

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

Go To: Top, Vibrational and/or electronic energy levels, References

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
The National Institute of Standards and Technology (NIST) uses its best efforts to deliver a high quality copy of the Database and to verify that the data contained therein have been selected on the basis of sound scientific judgment. However, NIST makes no warranties to that effect, and NIST shall not be liable for any damage that may result from errors or omissions in the Database.
Customer support for NIST Standard Reference Data products.