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(1+1) resonant enhanced multiphoton ionization via the A ^(2)Σ^+ state of NO: Ionic rotational branching ratios and their intensity dependence

Rudolph, H. and Dixit, S. N. and McKoy, V. and Huo, W. M. (1988) (1+1) resonant enhanced multiphoton ionization via the A ^(2)Σ^+ 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:20120607-134329906

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Abstract

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_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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1063/1.454130DOIUNSPECIFIED
http://link.aip.org/link/doi/10.1063/1.454130PublisherUNSPECIFIED
Additional Information:© 1987 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.
Funders:
Funding AgencyGrant Number
NSFCHE-8521391
Air Force Office of Scientific Research (AFOSR)87-0039
Department of Energy (DOE) Office of Health and Environmental Research DE-FG03-87ER60513
NASANCC2-319
Department of Energy (DOE)W-7405-Eng-48
Danish Natural Science Research CouncilUNSPECIFIED
Subject Keywords:multi-photon processes; photoionization; resonance; nitric oxide; photoelectron microscopy; rotational states; branching ratio; angular distribution
Classification Code:PACS: 33.80.Rv; 33.60.+q; 33.70.Fd
Record Number:CaltechAUTHORS:20120607-134329906
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20120607-134329906
Official Citation:(1+1) resonant enhanced multiphoton ionization via the A [sup 2] Sigma [sup + ] state of NO: Ionic rotational branching ratios and their intensity dependence H. Rudolph, S. N. Dixit, V. McKoy, and W. M. Huo, J. Chem. Phys. 88, 1516 (1988), DOI:10.1063/1.454130
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:31839
Collection:CaltechAUTHORS
Deposited By: Jason Perez
Deposited On:08 Jun 2012 20:09
Last Modified:26 Dec 2012 15:19

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