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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-329.485909
Energy at 298.15K-329.480716
Nuclear repulsion energy62.510441
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 3043 2920 3.49      
2 A1 2255 2164 64.60      
3 A1 1361 1306 30.09      
4 A1 949 910 220.41      
5 A1 709 680 6.52      
6 A2 198 190 0.00      
7 E 3124 2997 6.50      
7 E 3124 2997 6.50      
8 E 2259 2167 146.76      
8 E 2259 2167 146.76      
9 E 1526 1464 6.83      
9 E 1526 1464 6.83      
10 E 962 923 36.79      
10 E 962 923 36.79      
11 E 924 886 83.62      
11 E 924 886 83.62      
12 E 534 512 8.07      
12 E 534 512 8.07      

Unscaled Zero Point Vibrational Energy (zpe) 13585.4 cm-1
Scaled (by 0.9594) Zero Point Vibrational Energy (zpe) 13033.9 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 -1.248
Si2 0.000 0.000 0.636
H3 0.000 -1.026 -1.639
H4 -0.888 0.513 -1.639
H5 0.888 0.513 -1.639
H6 0.000 1.393 1.167
H7 -1.207 -0.697 1.167
H8 1.207 -0.697 1.167

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.88411.09771.09771.09772.78852.78852.7885
Si21.88412.49532.49532.49531.49121.49121.4912
H31.09772.49531.77691.77693.70493.07213.0721
H41.09772.49531.77691.77693.07213.07213.7049
H51.09772.49531.77691.77693.07213.70493.0721
H62.78851.49123.70493.07213.07212.41332.4133
H72.78851.49123.07213.07213.70492.41332.4133
H82.78851.49123.07213.70493.07212.41332.4133

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 110.876 C1 Si2 H7 110.876
C1 Si2 H8 110.876 Si2 C1 H3 110.841
Si2 C1 H4 110.841 Si2 C1 H5 110.841
H3 C1 H4 108.067 H3 C1 H5 108.067
H4 C1 H5 108.067 H6 Si2 H7 108.031
H6 Si2 H8 108.031 H7 Si2 H8 108.031
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3PW91/3-21G* Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.918      
2 Si 0.441      
3 H 0.227      
4 H 0.227      
5 H 0.227      
6 H -0.068      
7 H -0.068      
8 H -0.068      


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 -0.861 0.861
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.865 0.000 0.000
y 0.000 -22.865 0.000
z 0.000 0.000 -22.852
Traceless
 xyz
x -0.006 0.000 0.000
y 0.000 -0.006 0.000
z 0.000 0.000 0.013
Polar
3z2-r20.026
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> 50.412
(<r2>)1/2 7.100