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

using model chemistry: B3LYP/CEP-31G

19 10 17 12 22

States and conformations

State Conformation minimum conformation conformer description state description
1 1 yes C3 1A1
Energy calculated at B3LYP/CEP-31G
 hartrees
Energy at 0K-13.090453
Energy at 298.15K-13.085151
Nuclear repulsion energy22.106449
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 B3LYP/CEP-31G
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 3039 2943 25.52      
2 A1 2121 2054 73.88      
3 A1 1344 1301 29.28      
4 A1 897 869 199.63      
5 A1 676 655 6.52      
6 A2 153 148 0.00      
7 E 3133 3034 32.14      
7 E 3133 3034 32.16      
8 E 2143 2076 199.85      
8 E 2143 2076 199.86      
9 E 1485 1438 10.98      
9 E 1485 1438 10.98      
10 E 933 904 0.08      
10 E 933 904 0.08      
11 E 915 886 109.51      
11 E 915 886 109.50      
12 E 522 506 14.28      
12 E 522 506 14.28      

Unscaled Zero Point Vibrational Energy (zpe) 13246.7 cm-1
Scaled (by 0.9684) Zero Point Vibrational Energy (zpe) 12828.2 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 B3LYP/CEP-31G
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-31G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.990
Si2 0.000 0.000 -0.927
H3 0.000 1.031 1.383
H4 -0.893 -0.516 1.383
H5 0.893 -0.516 1.383
H6 0.000 -1.410 -1.467
H7 -1.221 0.705 -1.467
H8 1.221 0.705 -1.467

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.91671.10371.10371.10372.83332.83332.8333
Si21.91672.52972.52972.52971.51051.51051.5105
H31.10372.52971.78611.78613.75333.11833.1183
H41.10372.52971.78611.78613.11833.11833.7533
H51.10372.52971.78611.78613.11833.75333.1183
H62.83331.51053.75333.11833.11832.44302.4430
H72.83331.51053.11833.11833.75332.44302.4430
H82.83331.51053.11833.75333.11832.44302.4430

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 110.969 C1 Si2 H7 110.969
C1 Si2 H8 110.969 Si2 C1 H3 110.873
Si2 C1 H4 110.873 Si2 C1 H5 110.873
H3 C1 H4 108.034 H3 C1 H5 108.034
H4 C1 H5 108.034 H6 Si2 H7 107.933
H6 Si2 H8 107.933 H7 Si2 H8 107.933
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-31G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.635      
2 Si 0.285      
3 H 0.184      
4 H 0.184      
5 H 0.184      
6 H -0.067      
7 H -0.067      
8 H -0.067      


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 0.687 0.687
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -21.881 0.000 0.000
y 0.000 -21.881 0.000
z 0.000 0.000 -22.676
Traceless
 xyz
x 0.398 0.000 0.000
y 0.000 0.398 0.000
z 0.000 0.000 -0.795
Polar
3z2-r2-1.591
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 4.429 0.000 0.000
y 0.000 4.429 0.000
z 0.000 0.000 5.271


<r2> (average value of r2) Å2
<r2> 42.544
(<r2>)1/2 6.523