return to home page Computational Chemistry Comparison and Benchmark DataBase Release 22 (May 2022) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Calculated > Energy > Optimized > Energy

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

using model chemistry: PBEPBE/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 PBEPBE/3-21G
 hartrees
Energy at 0K-329.214857
Energy at 298.15K-329.209622
Nuclear repulsion energy61.542032
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 PBEPBE/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 2992 2965 4.74      
2 A1 2118 2099 58.01      
3 A1 1319 1307 15.23      
4 A1 876 868 172.53      
5 A1 679 672 3.52      
6 A2 179 178 0.00      
7 E 3078 3050 6.26      
7 E 3078 3050 6.26      
8 E 2133 2113 130.95      
8 E 2133 2113 130.97      
9 E 1490 1477 7.06      
9 E 1490 1477 7.07      
10 E 923 915 0.21      
10 E 923 915 0.21      
11 E 898 889 91.59      
11 E 898 889 91.59      
12 E 511 507 8.97      
12 E 511 507 8.97      

Unscaled Zero Point Vibrational Energy (zpe) 13114.7 cm-1
Scaled (by 0.9909) Zero Point Vibrational Energy (zpe) 12995.3 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 PBEPBE/3-21G
See section I.F.4 to change rotational constant units
Geometric Data calculated at PBEPBE/3-21G

Point Group is C3v

Cartesians (Å)
Atom x (Å) y (Å) z (Å)
C1 0.000 0.000 -1.276
Si2 0.000 0.000 0.648
H3 0.000 -1.035 -1.660
H4 -0.896 0.517 -1.660
H5 0.896 0.517 -1.660
H6 0.000 1.414 1.187
H7 -1.225 -0.707 1.187
H8 1.225 -0.707 1.187

Atom - Atom Distances (Å)
  C1 Si2 H3 H4 H5 H6 H7 H8
C11.92391.10341.10341.10342.83982.83982.8398
Si21.92392.52912.52912.52911.51321.51321.5132
H31.10342.52911.79181.79183.75483.11613.1161
H41.10342.52911.79181.79183.11613.11613.7548
H51.10342.52911.79181.79183.11613.75483.1161
H62.83981.51323.75483.11613.11612.44922.4492
H72.83981.51323.11613.11613.75482.44922.4492
H82.83981.51323.11613.75483.11612.44922.4492

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 110.859 C1 Si2 H7 110.859
C1 Si2 H8 110.859 Si2 C1 H3 110.360
Si2 C1 H4 110.360 Si2 C1 H5 110.360
H3 C1 H4 108.568 H3 C1 H5 108.568
H4 C1 H5 108.568 H6 Si2 H7 108.048
H6 Si2 H8 108.048 H7 Si2 H8 108.048
Electronic energy levels
Charges, Dipole, Quadrupole and Polarizability
Charges from optimized geometry at PBEPBE/3-21G Charges (e)
Number Element Mulliken CHELPG AIM ESP
1 C -0.939      
2 Si 0.506      
3 H 0.228      
4 H 0.228      
5 H 0.228      
6 H -0.083      
7 H -0.083      
8 H -0.083      


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 -0.771 0.771
CHELPG        
AIM        
ESP        


Electric Quadrupole moment
Quadrupole components in D Å
Primitive
 xyz
x -23.307 0.000 0.000
y 0.000 -23.307 0.000
z 0.000 0.000 -23.251
Traceless
 xyz
x -0.028 0.000 0.000
y 0.000 -0.028 0.000
z 0.000 0.000 0.056
Polar
3z2-r20.112
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 4.677 0.000 0.000
y 0.000 4.677 -0.000
z 0.000 -0.000 5.408


<r2> (average value of r2) Å2
<r2> 51.892
(<r2>)1/2 7.204