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

Vrakking, Marcus J. J.; Bracker, Allan S.; Suzuki, Toshinori; Lee, Yuan T.
March 1993
Review of Scientific Instruments;Mar93, Vol. 64 Issue 3, p645
Academic Journal
Ultrasensitive detection of molecular hydrogen is reported by using Doppler-free (2+1) resonance-enhanced multiphoton ionization through the E,F 1Σ+g state. By using an arrangement with two near-transform-limited counterpropagating laser beams, a single-shot detection efficiency of 6.8×103 molecules/cm3 has been demonstrated. Frequency scans of the two-photon transitions show that the detection efficiency is limited by ac Stark effects.


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