Dear Turbomole enthusiasts,
an analytical force constant calculation of IrN yielded the following output:
mode 1 2 3 4 5 6
frequency 0.00 0.00 0.00 0.00 0.00 1239.80
symmetry a1
IR - - - - - YES
|dDIP/dQ| (a.u.) 0.0000 0.0000 0.0000 0.0000 0.0000 0.0056
intensity (km/mol) 0.00 0.00 0.00 0.00 0.00 56.16
intensity ( % ) 0.00 0.00 0.00 0.00 0.00 100.00
RAMAN - - - - - YES
1 ir x 0.00000 0.00000 1.00000 0.00000 0.00000 0.00000
y 0.00000 0.00000 0.00000 0.00000 1.00000 0.00000
z 0.00000 0.70711 0.00000 0.00000 0.00000 -0.07268
2 n x 0.00000 0.00000 0.00000 1.00000 0.00000 0.00000
y 1.00000 0.00000 0.00000 0.00000 0.00000 0.00000
z 0.00000 0.70711 0.00000 0.00000 0.00000 0.99736
reduced mass(g/mol) 14.007 103.113 192.220 14.007 192.220 14.948
The reduced mass is calculated to be 14.948, but should it not be 192.220*14.007/(192.220+14.007)=13.056? What am I missing?
Thank you for your help
/Edit: and for N2 it is 14?
mode 1 2 3 4 5 6
frequency 0.00 0.00 0.00 0.00 0.00 2348.41
symmetry a1g
IR - - - - - NO
|dDIP/dQ| (a.u.) 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000
intensity (km/mol) 0.00 0.00 0.00 0.00 0.00 0.00
intensity ( % ) 0.00 0.00 0.00 0.00 0.00 0.00
RAMAN - - - - - YES
1 n x 0.00000 0.00000 0.00000 1.00000 0.00000 0.00000
y 0.00000 1.00000 0.00000 0.00000 0.00000 0.00000
z 0.70711 0.00000 0.00000 0.00000 0.00000 0.70711
2 n x 0.00000 0.00000 1.00000 0.00000 0.00000 0.00000
y 0.00000 0.00000 0.00000 0.00000 1.00000 0.00000
z 0.70711 0.00000 0.00000 0.00000 0.00000 -0.70711
reduced mass(g/mol) 14.003 14.003 14.003 14.003 14.003 14.003
/Edit2:
Taking the wavenumber and force constant from that calculation I derive a reduced mass of 13.055474:
You have: (0.7594293 hartree / atomiclength^2)/(1239.80 cm^-1 * c * 2 * pi)^2*N_A
You want: g/mol
* 13.055474
I am really curious what that reduced mass in the aoforce output means.