Abstract
The relationship between quantum-state populations and ion signals in (2+1) resonance-enhanced multiphoton ionization (REMPI) detection of H2, HD, and D2 via the E, F 1Σ+g (v′E=0, J′=J″)–X 1Σ+g (v″,J″) transition is determined by calibration against a thermal effusive source. Correction factors are obtained for 102 rovibrational levels for v″=0, 1, and 2 and J″ ranging from 0 to 17. Within a given v″, rotational correction factors are nearly unity except for the highest J″ levels. The vibrational correction factors vary with v″; (2+1) REMPI detection is 2–3 times more sensitive to v″=1 and 2 than to v″=0. Experimental correction factors are compared with those derived from a theoretical calculation of the two-photon transition moments by Huo et al. [J. Chem. Phys. 95, xxxx (1991)]. In general, the agreement is excellent, which suggests that theoretical correction factors may be used when experimental ones are unavailable.
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