Rudolph, H. and Dixit, S. N. and McKoy, V. and Huo, W. M. (1988) (1+1) resonant enhanced multiphoton ionization via the A ^2Σ^+ state of NO: Ionic rotational branching ratios and their intensity dependence. Journal of Chemical Physics, 88 (3). pp. 1516-1521. ISSN 0021-9606 http://resolver.caltech.edu/CaltechAUTHORS:20120725-091029378
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Recent high resolution photoelectron spectroscopic studies of the (1+1) resonant enhanced multiphoton ionization (REMPI) of NO via the 0–0 transition of the A–X band (γ band) have shown a pronounced ΔN=0 signal (ΔN≡N_+−N_i) and smaller, but measurable, ΔN=±2 peaks. The authors [K. S. Viswanathan et al., J. Phys. Chem. 90, 5078 (1986)] assign the excitation to be via an R(21.5) line, with no further specification. We have performed ab initio calculations of the rotational branching ratios for the four possible ‘‘R(21.5)’’ transitions, namely, the rotationally ‘‘clean’’ R_(21) and R_(22), and the ‘‘mixed’’ R_(12)+Q_(22) and R_(11)+Q_(21) branches. We find the mixed R_(12)+Q_(22)(21.5) branch to agree best with the observed photoelectron spectrum collected parallel to the polarization vector of the light. The discrepancy is larger for detection perpendicular to the polarization. To understand this difference, we have assessed the influence of laser intensity and polarization ‘‘contamination’’ on the branching ratios and photoelectron angular distributions.
|Additional Information:||© 1988 American Institute of Physics. Received 28 August 1987; accepted 20 October 1987. This material is based on research supported by the National Science Foundation under Grant No. CHE-8521391, by AFOSR under Grant No. 87-0039, by the office of Health and Environmental Research of DOE (DE-FG03- 87ER60513), and by NASA Cooperative Agreement NCC2-319. Work done by S. N. D. was performed under the auspices of the U. S. Department of Energy by Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48. H. R. gratefully acknowledges the support of the Danish Natural Science Research Council.|
|Subject Keywords:||MULTI−PHOTON PROCESSES, PHOTOIONIZATION, RESONANCE, NITRIC OXIDE, PHOTOELECTRON SPECTROSCOPY, ROTATIONAL STATES, BRANCHING RATIO, ANGULAR DISTRIBUTION|
|Classification Code:||PACS: 33.80.Rv; 33.60.+q; 33.70.Fd|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||25 Jul 2012 20:38|
|Last Modified:||26 Dec 2012 15:43|
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