Ultrasensitive detection of hydrogen molecules by (2+1) resonance-enhanced multiphoton ionization

Journal Article · Mon Mar 01 00:00:00 EST 1993 · Review of Scientific Instruments; (United States)

DOI:https://doi.org/10.1063/1.1144191· OSTI ID:6881509

Vrakking, M J.J.; Bracker, A S; Suzuki, T; Lee, Y T ^[1]

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1. Chemical Sciences Division, Lawrence Berkeley Laboratory, and Department of Chemistry, University of California at Berkeley, Berkeley, California 94720 (United States)

Ultrasensitive detection of molecular hydrogen is reported by using Doppler-free (2+1) resonance-enhanced multiphoton ionization through the [ital E],[ital F] [sup 1][Sigma][sub [ital g]][sup +] state. By using an arrangement with two near-transform-limited counterpropagating laser beams, a single-shot detection efficiency of 6.8[times]10[sup 3] molecules/cm[sup 3] has been demonstrated. Frequency scans of the two-photon transitions show that the detection efficiency is limited by ac Stark effects.

• DOE Contract Number: AC03-76SF00098
• OSTI ID: 6881509
• Journal Information: Review of Scientific Instruments; (United States), Journal Name: Review of Scientific Instruments; (United States) Vol. 64:3; ISSN 0034-6748; ISSN RSINAK
• Country of Publication: United States
• Language: English

Related Subjects

664200* -- Spectra of Atoms & Molecules & their Interactions with Photons-- (1992-)
74 ATOMIC AND MOLECULAR PHYSICS
DETECTION
DOPPLER EFFECT
EFFICIENCY
ELEMENTS
HYDROGEN
IONIZATION
LAWRENCE BERKELEY LABORATORY
MULTI-PHOTON PROCESSES
NATIONAL ORGANIZATIONS
NONMETALS
STARK EFFECT
US AEC
US DOE
US ERDA
US ORGANIZATIONS