( 2 + 1 ) Resonance-enhanced ionization spectroscopy of a state-selected beam of OH radicals | Zendy

Margaret E. Greenslade | Zendy; Marsha I. Lester | Zendy; Dragana Č. Radenović | Zendy; André J. A. van Roij | Zendy; David H. Parker | Zendy

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( 2 + 1 ) Resonance-enhanced ionization spectroscopy of a state-selected beam of OH radicals

Author(s) -

Margaret E. Greenslade,

Marsha I. Lester,

Dragana Č. Radenović,

André J. A. van Roij,

David H. Parker

Publication year - 2005

Publication title -

the journal of chemical physics

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.071

H-Index - 357

eISSN - 1089-7690

pISSN - 0021-9606

DOI - 10.1063/1.1997132

Subject(s) - radical , chemistry , rydberg formula , spectroscopy , excited state , atomic physics , rydberg state , ionization , resonance enhanced multiphoton ionization , resonance (particle physics) , ground state , vibronic spectroscopy , photoionization , physics , ion , organic chemistry , quantum mechanics

A state-selected beam of hydroxyl radicals is generated using a pulsed discharge source and hexapole field. The OH radicals are characterized by resonance-enhanced multiphoton ionization (REMPI) spectroscopy via the nested D 2Sigma- and 3 2Sigma- Rydberg states. Simplified spectra are observed from the selected |MJ|=3/2 component of the upper Lambda-doublet level of the lowest rotational state (J=32) in ground (v"=0) and excited (v"=1-3) vibrational levels of the OH X 2Pi3/2 state. Two-photon transitions are observed to the D 2Sigma-(v'=0-3) and 3 2Sigma-(v'=0,1) vibronic levels, extending previous studies to higher vibrational levels of the Rydberg states. Spectroscopic constants are derived for the Rydberg states and compared with prior experimental studies. Complementary first-principle theoretical studies of the properties of the D 2Sigma- and 3 2Sigma- Rydberg states [see M. P. J. van der Loo and G. C. Groenenboom, J. Chem. Phys. 123, 074310 (2005), following paper] are used to interpret the experimental findings and examine the utility of the (2+1) REMPI scheme for sensitive detection of OH radicals.

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