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

using model chemistry: B3LYP/CEP-121G

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-121G
 hartrees
Energy at 0K-13.097458
Energy at 298.15K-13.092164
Nuclear repulsion energy22.140404
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-121G
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 2996 2920 19.51      
2 A1 2139 2084 75.64      
3 A1 1347 1312 20.64      
4 A1 899 876 211.60      
5 A1 671 654 7.32      
6 A2 149 145 0.00      
7 E 3094 3015 23.04      
7 E 3094 3015 23.06      
8 E 2156 2101 176.02      
8 E 2156 2101 176.03      
9 E 1497 1459 9.00      
9 E 1497 1459 9.00      
10 E 933 909 0.01      
10 E 933 909 0.01      
11 E 916 892 106.13      
11 E 916 892 106.12      
12 E 523 510 16.31      
12 E 523 510 16.31      

Unscaled Zero Point Vibrational Energy (zpe) 13218.4 cm-1
Scaled (by 0.9745) Zero Point Vibrational Energy (zpe) 12881.3 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-121G
See section I.F.4 to change rotational constant units
Geometric Data calculated at B3LYP/CEP-121G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 0.992
Si2 0.000 0.000 -0.928
H3 0.000 1.025 1.382
H4 -0.888 -0.513 1.382
H5 0.888 -0.513 1.382
H6 0.000 -1.411 -1.467
H7 -1.222 0.706 -1.467
H8 1.222 0.706 -1.467

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.91991.09711.09711.09712.83482.83482.8348
Si21.91992.52762.52762.52761.51041.51041.5104
H31.09712.52761.77591.77593.74873.11643.1164
H41.09712.52761.77591.77593.11643.11643.7487
H51.09712.52761.77591.77593.11643.74873.1164
H62.83481.51043.74873.11643.11642.44412.4441
H72.83481.51043.11643.11643.74872.44412.4441
H82.83481.51043.11643.74873.11642.44412.4441

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 110.895 C1 Si2 H7 110.895
C1 Si2 H8 110.895 Si2 C1 H3 110.844
Si2 C1 H4 110.844 Si2 C1 H5 110.844
H3 C1 H4 108.065 H3 C1 H5 108.065
H4 C1 H5 108.065 H6 Si2 H7 108.010
H6 Si2 H8 108.010 H7 Si2 H8 108.010
Electronic energy levels

Electronic state

Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at B3LYP/CEP-121G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.735      
2 Si 0.495      
3 H 0.173      
4 H 0.173      
5 H 0.173      
6 H -0.093      
7 H -0.093      
8 H -0.093      


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 0.715 0.715
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -22.247 0.000 0.000
y 0.000 -22.247 0.000
z 0.000 0.000 -22.963
Traceless
 xyz
x 0.358 0.000 0.000
y 0.000 0.358 0.000
z 0.000 0.000 -0.716
Polar
3z2-r2-1.432
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 5.348 0.000 0.000
y 0.000 5.348 0.000
z 0.000 0.000 5.964


<r2> (average value of r2) Å2
<r2> 42.737
(<r2>)1/2 6.537