Vibrational state dependence of ionic rotational branching ratios in resonance enhanced multiphoton ionization of CH
- 15 July 1989
- journal article
- letter
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 91 (2) , 1374-1376
- https://doi.org/10.1063/1.457161
Abstract
We show that rapid evolution of a Rydberg orbital with internuclear distance in a resonance enhanced multiphoton ionization (REMPI) process can have a profound influence on the production of molecular ions in alternative rotational states. This is illustrated by calculations of ionic rotational branching ratios for (2+1’) REMPI via the O11 (20.5) branch of the E’ 2Σ+(3pσ) Rydberg state of CH. The rotational propensity rule for ionization changes from ΔN=odd (ΔN=N+−Ni) at lower vibrational excitation, as expected from the ΔN+l=odd selection rule, to ΔN=even at higher vibrational levels. This effect is expected to be quite general and should be most readily observable in diatomic hydrides.Keywords
This publication has 13 references indexed in Scilit:
- Rotational branching ratios at low photoelectron energies in resonant enhanced multiphoton ionization of NOThe Journal of Chemical Physics, 1989
- Non-Franck-Condon Effects Induced by Orbital Evolution and Cooper Minima in Excited-State Photoionization of OHPhysical Review Letters, 1989
- Ionic rotational branching ratios in resonant enhanced multiphoton ionization of NO via the A 2Σ+(3sσ) and D 2Σ+(3pσ) statesThe Journal of Chemical Physics, 1988
- High-resolution zero-kinetic-energy photoelectron spectroscopy of nitric oxidePhysical Review A, 1987
- Resonant multiphoton ionization spectrum and electronic structure of CH radical. New states and assignments above 50 000 cm−1The Journal of Chemical Physics, 1987
- Photodissociation processes in the CH moleculeThe Journal of Chemical Physics, 1987
- Rotationally resolved laser photoelectron spectra of gas-phase NO: rotational propensity rules in photoionizationThe Journal of Physical Chemistry, 1986
- Ionic rotational selection rules for (n + 1) resonant enhanced multiphoton ionizationChemical Physics Letters, 1986
- Rotational branching ratios in (1+1) resonant-enhanced multiphoton ionization of NO via thestatePhysical Review A, 1985
- Photoionization of excited molecular states. H2 C 1ΠuChemical Physics Letters, 1984