Silylene

Formula: H₂Si
Molecular weight: 30.1014
IUPAC Standard InChI: InChI=1S/H2Si/h1H2
IUPAC Standard InChIKey: XMIJDTGORVPYLW-UHFFFAOYSA-N
CAS Registry Number: 13825-90-6
Chemical structure:
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Vibrational and/or electronic energy levels

State: B

Energy (cm^-1)		Med.	References


T = 27650	T	gas	Muramoto, Ishikawa, et al., 2005

State: A

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


T_o = 15547.77	gas	A-X	480	650	Dubois, Herzberg, et al., 1967
					Dubois, 1968
					Ishikawa and Kajimoto, 1991
					Fukushima, Mayama, et al., 1992
					Ishikawa and Kajimoto, 1993
					Escribano and Campargue, 1998
					Nakajima, Kawai, et al., 2002

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


a₁	1	Sym. stretch	1990	gas	LF	Ishikawa and Kajimoto, 1993
	2	Bend	854	gas	AB LF	Dubois, Herzberg, et al., 1967 Fukushima, Mayama, et al., 1992 Ishikawa and Kajimoto, 1993

State: a

Energy (cm^-1)	Med.	References


T_o = 7340 ± 240	gas	Berkowitz, Greene, et al., 1987
		Fukushima, Mayama, et al., 1992

State: X

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


a₁	1	Sym. stretch	1995.93	gas	LF DL	Ishikawa and Kajimoto, 1991 Ishikawa and Kajimoto, 1993 Ishikawa and Kajimoto, 1995 Hirota and Ishikawa, 1999
	1	Sym. stretch	1995.93	gas	SEP	Ishikawa, Muramoto, et al., 2002
	1	Sym. stretch	1999.3	Ne	IR	Andrews and Wang, 2002
	1	Sym. stretch	1993.4	Ne	IR	Andrews and Wang, 2002
	1	Sym. stretch	1992.8	Ar	IR	Fredin, Hauge, et al., 1985 Andrews and Wang, 2002
	1	Sym. stretch	1993.7	Kr	IR	Legay-Sommaire and Legay, 1998
	2	Bend	999.03	gas	LF DL	Dubois, 1968 Inoue and Suzuki, 1984 Yamada, Kanamori, et al., 1989 Ishikawa and Kajimoto, 1993 Ishikawa and Kajimoto, 1995
	2	Bend	999.03	gas	SEP	Ishikawa, Muramoto, et al., 2002
	2	Bend	1002.5	Ne	IR	Andrews and Wang, 2002
	2	Bend	1001.8	Ne	IR	Andrews and Wang, 2002
	2	Bend	994.6	Ar	IR	Fredin, Hauge, et al., 1985 Andrews and Wang, 2002
	2	Bend	998.5	Kr	IR	Legay-Sommaire and Legay, 1998
b₂	3	Asym. stretch	1992.82	gas	DL	Legay-Sommaire and Legay, 1998
	3	Asym. stretch	1984.1	Ne	IR	Andrews and Wang, 2002
	3	Asym. stretch	1981.6	Ne	IR	Andrews and Wang, 2002
	3	Asym. stretch	1976.2	Ar	IR	Fredin, Hauge, et al., 1985 Andrews and Wang, 2002
	3	Asym. stretch	1972.8	Ar	IR	Fredin, Hauge, et al., 1985 Andrews and Wang, 2002

Additional references: Jacox, 1994, page 19; Jacox, 1998, page 131; Jacox, 2003, page 17; Dubois, Duxbury, et al., 1975; Inoue and Suzuki, 1985; Thoman and Steinfeld, 1986; Duxbury, Alijah, et al., 1993; Fukushima and Obi, 1994

Notes

Tentative assignment or approximate value

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

Muramoto, Ishikawa, et al., 2005
Muramoto, Y.; Ishikawa, H.; Mikami, N., First observation of the B [sup 1]A[sub 1] state of SiH[sub 2] and SiD[sub 2] radicals by optical-optical double resonance spectroscopy, J. Chem. Phys., 2005, 122, 15, 154302, https://doi.org/10.1063/1.1881172 . [all data]

Dubois, Herzberg, et al., 1967
Dubois, I.; Herzberg, G.; Verma, R.D., Spectrum of SiH2, J. Chem.Phys., 1967, 47, 10, 4262, https://doi.org/10.1063/1.1701609 . [all data]

Dubois, 1968
Dubois, I., The absorption spectrum of the free SiH, Can. J. Phys., 1968, 46, 22, 2485, https://doi.org/10.1139/p68-608 . [all data]

Ishikawa and Kajimoto, 1991
Ishikawa, H.; Kajimoto, O., Fermi resonance and vibrational analysis of SiH2 () based on the LIF excitation spectra of the transitions, J. Mol. Spectrosc., 1991, 150, 2, 610, https://doi.org/10.1016/0022-2852(91)90252-6 . [all data]

Fukushima, Mayama, et al., 1992
Fukushima, M.; Mayama, S.; Obi, K., Jet spectroscopy and excited state dynamics of SiH2 and SiD2, J. Chem. Phys., 1992, 96, 1, 44, https://doi.org/10.1063/1.462479 . [all data]

Ishikawa and Kajimoto, 1993
Ishikawa, H.; Kajimoto, O., Vibrational Analysis of SiH2 (Ã1B1), J. Mol. Spectrosc., 1993, 160, 1, 1, https://doi.org/10.1006/jmsp.1993.1153 . [all data]

Escribano and Campargue, 1998
Escribano, R.; Campargue, A., Absorption spectroscopy of SiH[sub 2] near 640 nm, J. Chem. Phys., 1998, 108, 15, 6249, https://doi.org/10.1063/1.476062 . [all data]

Nakajima, Kawai, et al., 2002
Nakajima, M.; Kawai, A.; Fukushima, M.; Obi, K., LIF spectroscopy and dissociation dynamics of the SiH2 radical in the (1,v2,0) state, Chem. Phys. Lett., 2002, 364, 1-2, 99, https://doi.org/10.1016/S0009-2614(02)01308-8 . [all data]

Berkowitz, Greene, et al., 1987
Berkowitz, J.; Greene, J.P.; Cho, H.; Ruscic, B., Photoionization mass spectrometric studies of SiH_n (n=1-4), J. Chem. Phys., 1987, 86, 1235. [all data]

Ishikawa and Kajimoto, 1995
Ishikawa, H.; Kajimoto, O., Reanalysis of the Vibrational Resonances of SiH2 in the X1A1 State, J. Mol. Spectrosc., 1995, 174, 1, 270, https://doi.org/10.1006/jmsp.1995.1286 . [all data]

Hirota and Ishikawa, 1999
Hirota, E.; Ishikawa, H., The vibrational spectrum and molecular constants of silicon dihydride SiH[sub 2] in the ground electronic state, J. Chem. Phys., 1999, 110, 9, 4254, https://doi.org/10.1063/1.478308 . [all data]

Ishikawa, Muramoto, et al., 2002
Ishikawa, H.; Muramoto, Y.; Mikami, N., Stimulated Emission Pumping Spectroscopy of SiH2: First Observation of the Spin--Orbit Interaction between the X1A1 and the ã3B1 States, J. Mol. Spectrosc., 2002, 216, 1, 90, https://doi.org/10.1006/jmsp.2002.8666 . [all data]

Andrews and Wang, 2002
Andrews, L.; Wang, X., Infrared Spectra of the Novel Si, J. Phys. Chem. A, 2002, 106, 34, 7696, https://doi.org/10.1021/jp0204814 . [all data]

Fredin, Hauge, et al., 1985
Fredin, L.; Hauge, R.H.; Kafafi, Z.H.; Margrave, J.L., Matrix isolation studies of the reactions of silicon atoms with molecular hydrogen. The infrared spectrum of silylene, J. Chem. Phys., 1985, 82, 8, 3542, https://doi.org/10.1063/1.448933 . [all data]

Legay-Sommaire and Legay, 1998
Legay-Sommaire, N.; Legay, F., Photochemical Insertion Reaction of Hg in SiH, J. Phys. Chem. A, 1998, 102, 45, 8759, https://doi.org/10.1021/jp9821533 . [all data]

Inoue and Suzuki, 1984
Inoue, G.; Suzuki, M., Laser-induced fluorescence of the SiH2 radical, Chem. Phys. Lett., 1984, 105, 6, 641, https://doi.org/10.1016/0009-2614(84)85673-0 . [all data]

Yamada, Kanamori, et al., 1989
Yamada, C.; Kanamori, H.; Hirota, E.; Nishiwaki, N.; Itabashi, N.; Kato, K.; Goto, T., Detection of the silylene ν2 band by infrared diode laser kinetic spectroscopy, J. Chem. Phys., 1989, 91, 8, 4582, https://doi.org/10.1063/1.456746 . [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]

Dubois, Duxbury, et al., 1975
Dubois, I.; Duxbury, G.; Dixon, R.N., J. Chem. Soc., 1975, Faraday Trans. 2 71, 799. [all data]

Inoue and Suzuki, 1985
Inoue, G.; Suzuki, M., Reactions of SiH2(X1A1) with H2, CH4, C2H4, SiH4 and Si2H6 at 298 K, Chem. Phys. Lett., 1985, 122, 4, 361, https://doi.org/10.1016/0009-2614(85)80237-2 . [all data]

Thoman and Steinfeld, 1986
Thoman, J.W., Jr.; Steinfeld, J.I., Laser-excited fluorescence detection of SiH2 produced in IR MPD of organosilanes, Chem. Phys. Lett., 1986, 124, 1, 35, https://doi.org/10.1016/0009-2614(86)85008-4 . [all data]

Duxbury, Alijah, et al., 1993
Duxbury, G.; Alijah, A.; Trieling, R.E., Renner--Teller and spin--orbit interactions in SiH2, J. Chem. Phys., 1993, 98, 2, 811, https://doi.org/10.1063/1.464245 . [all data]

Fukushima and Obi, 1994
Fukushima, M.; Obi, K., Rotational analysis of the SiD2 A 1B1--X 1A1 transition observed in a jet, J. Chem. Phys., 1994, 100, 9, 6221, https://doi.org/10.1063/1.467085 . [all data]

Notes

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

Data from NIST Standard Reference Database 69: NIST Chemistry WebBook
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