Predissociation of the 4p pi L-1 Pi Rydberg state of carbon monoxide

Year: 2002

Authors: Cacciani P., Brandi F., Sprengers J.P., Johansson A., L\’Huillier A., Wahlström C.-G., Ubachs W.

Autors Affiliation: Laboratoire PhLAM, CERLA FR 2416 CNRS, Université des Sciences et Technologies de Lille, 59655 Villeneuve d\’Ascq, France; Department of Physics and Astronomy, Vrije Universiteit, De Boelelaan 1081, 1081 HV Amsterdam, Netherlands; Department of Physics, Lund Institute of Technology, P.O. Box 118, S-221 00 Lund, Sweden

Abstract: Time-domain and frequency-domain spectroscopic experiments have been performed on the (4ppc)L1?, ? = 0 Rydberg state in three isotopomers of carbon monoxide. Accurate values for the excited state lifetimes of the f-parity components have been determined: t(12C16O) = 1.08 ± 0.05 ns, t(13C16O) = 72 ± 10 ps and t(13C18O) = 29 ± 6 ps. The spectral resolution in the frequency-domain experiment goes as far as the limit imposed by the natural lifetime; Q-branch lines, or f-parity components of the heavier isotopes, are resolved for the first time. Highly accurate transition frequencies are determined in a molecular beam experiment using comparison and interpolation with a saturated iodine reference standard. The results reveal a number of perturbations and predissociation mechanisms, displaying a high degree of complexity in the energetic region of the 4p Rydberg states of CO with strong isotopic effects.

Journal/Review: CHEMICAL PHYSICS

Volume: 282 (1)      Pages from: 63  to: 73

More Information: Foundation for Fundamental Research on Matter, FOM. Vrije Universiteit Amsterdam, VU, HPRI-CT-1999-00064. HPRI-CT-1999-00041. – P.C. and W.U. wish to thank the Lund Laser Centre for their hospitality. The work in Lund was supported by the European Community – Access to Research Infrastructures action of the Improving Human Potential Programme, Contract No. HPRI-CT-1999-00041. P.C. and A.J. wish to thank the Laser Centre Vrije Universiteit for their hospitality. The work in Amsterdam was supported by the European Community – Access to Research Infrastructures action of the Improving Human Potential Programme, Contract No. HPRI-CT-1999-00064. The authors wish to thank K.P. Huber (NRC Ottawa) for advice and for critically reading the manuscript. Financial support from the Netherlands Foundation for Research of Matter (FOM) is gratefully acknowledged.
KeyWords: LIFETIME MEASUREMENTS; ROTATIONAL STRUCTURE; SPECTROSCOPY; PHOTODISSOCIATION; (CO)-C-13-O-18; ISOTOPOMERS; FREQUENCIES

DOI: 10.1016/S0301-0104(02)00622-5

Citations: 20
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