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All results from a given calculation for CH3SiH3 (methyl silane)

using model chemistry: B3PW91/3-21G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at B3PW91/3-21G
 hartrees
Energy at 0K-329.400945
Energy at 298.15K-329.395701
Nuclear repulsion energy61.899174
The energy at 298.15K was derived from the energy at 0K and an integrated heat capacity that used the calculated vibrational frequencies.
Vibrational Frequencies calculated at B3PW91/3-21G
Mode Number Symmetry Frequency
(cm-1)
Scaled Frequency
(cm-1)
IR Intensities
(km mol-1)
Raman Act
4/u)
Dep P Dep U
1 A1 3062 2943 4.97      
2 A1 2174 2090 64.87      
3 A1 1364 1311 20.03      
4 A1 910 874 205.06      
5 A1 695 668 4.19      
6 A2 177 170 0.00      
7 E 3148 3026 6.19      
7 E 3148 3026 6.19      
8 E 2183 2099 149.36      
8 E 2183 2099 149.37      
9 E 1529 1470 8.15      
9 E 1529 1470 8.15      
10 E 952 915 1.66      
10 E 952 915 1.66      
11 E 928 892 105.92      
11 E 928 892 105.92      
12 E 529 509 12.19      
12 E 529 509 12.19      

Unscaled Zero Point Vibrational Energy (zpe) 13459.3 cm-1
Scaled (by 0.9612) Zero Point Vibrational Energy (zpe) 12937.0 cm-1
See section III.C.1 List or set vibrational scaling factors to change the scale factors used here.
See section III.C.2 Calculate a vibrational scaling factor for a given set of molecules to determine the least squares best scaling factor.
Rotational Constants (cm-1) from geometry optimized at B3PW91/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3PW91/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.269
Si2 0.000 0.000 0.645
H3 0.000 -1.027 -1.653
H4 -0.889 0.513 -1.653
H5 0.889 0.513 -1.653
H6 0.000 1.404 1.180
H7 -1.216 -0.702 1.180
H8 1.216 -0.702 1.180

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.91481.09591.09591.09592.82312.82312.8231
Si21.91482.51702.51702.51701.50231.50231.5023
H31.09592.51701.77831.77833.73253.09953.0995
H41.09592.51701.77831.77833.09953.09953.7325
H51.09592.51701.77831.77833.09953.73253.0995
H62.82311.50233.73253.09953.09952.43202.4320
H72.82311.50233.09953.09953.73252.43202.4320
H82.82311.50233.09953.73253.09952.43202.4320

picture of methyl silane state 1 conformation 1
More geometry information
Calculated Bond Angles
atom1 atom2 atom3 angle atom1 atom2 atom3 angle
C1 Si2 H6 110.837 C1 Si2 H7 110.837
C1 Si2 H8 110.837 Si2 C1 H3 110.472
Si2 C1 H4 110.472 Si2 C1 H5 110.472
H3 C1 H4 108.452 H3 C1 H5 108.452
H4 C1 H5 108.452 H6 Si2 H7 108.072
H6 Si2 H8 108.072 H7 Si2 H8 108.072
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.992      
2 Si 0.630      
3 H 0.234      
4 H 0.234      
5 H 0.234      
6 H -0.114      
7 H -0.114      
8 H -0.114      


Electric dipole moments
Electric dipole components in Debye
(What's a Debye? See section VII.A.3)
  x y z Total
  0.000 0.000 -0.744 0.744
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.314 0.000 0.000
y 0.000 -23.314 0.000
z 0.000 0.000 -23.330
Traceless
 xyz
x 0.008 0.000 0.000
y 0.000 0.008 0.000
z 0.000 0.000 -0.016
Polar
3z2-r2-0.032
x2-y20.000
xy0.000
xz0.000
yz0.000


Polarizabilities
Components of the polarizability tensor.
Units are Å3 (Angstrom cubed)
Change units.
  x y z
x 0.000 0.000 0.000
y 0.000 0.000 0.000
z 0.000 0.000 0.000


<r2> (average value of r2) Å2
<r2> 51.511
(<r2>)1/2 7.177