Structure Data of Free Polyatomic Molecules
107
LIF
CH2Si
State
Energy [eV]
r0(Si=C) [Å]
r0(C−H) [Å]
θ0(H−C−H) [deg]
Reference
Silylidene
Methylenesilylene
~
X 1A 1
0.00
1.706(5)
1.099(3)
114.4(2)
[1]
~
A 1A 2
1.876
1.873(2)
1.099(5)
113.9(3)
[2]
C2v
~
B 1B2
3.634
1.815(5)
1.073(4)
133.7(1)
[1]
H
Si
H
Silylidene and silylidene-d2 were produced in a pulsed-jet discharge using tetramethylsilane
~
~
and tetramethylsilane-d12 as precursors. The B 1B2 – X 1A1 transition was studied by laser~
~
induced fluorescence [1]. The electronically forbidden A 1A2 – X 1A1 transition was observed
by LIF and stimulated emission pumping (SEP) techniques [2]. Molecular structures for the
three electronic states were deduced from the rotational constants.
[1] Harper, W.W., Waddell, K.W., Clouthier, D.J.: J. Chem. Phys. 107 (1997) 8829.
[2] Smith, T.C., Evans, C.J., Clouthier, D.J.: J. Chem. Phys. 118 (2003) 1642.
Landolt-Börnstein
New Series II/28B