The 2+1 multiphoton ionization spectrum of the C'-X transition
This example is taken from "The resonance enhanced multiphoton
ionization spectroscopy of ammonia isotopomers NH3, NH2D,
NHD2 and ND3", M. Nolde, K.-M. Weitzel and C.
M. Western, Phys. Chem. Chem. Phys. 7, 1527 (2005) http://dx.doi.org/10.1039/b417835c.
Data file: nh3c0x0.pgo
data file simulates the origin band of the C'-X 2 + 1 multiphoton
transition in NH3
. See the paper for the constants
used; note the ground state constants are not the best available
but are adequate for the Doppler limited resolution. There are two
points that are slightly non-standard:
- The point group used is D3h, rather than C3v.
This is necessary to account for the inversion doubling in the
- There are two spherical
transition moments contributing to the transition, a
zero rank component, <v=0|T(0,0)|v=0> and a second rank
The picture below shows a simulation at 300K.