Detection and characterization of gas-phase GaCl using resonance enhanced multiphoton ionization

Dearden, David V.; Johnson, Russell D.; Hudgens, Jeffrey W.
December 1992
Journal of Chemical Physics;12/15/1992, Vol. 97 Issue 12, p8880
Academic Journal
We report resonance enhanced multiphoton ionization (REMPI) spectra of gas-phase gallium monochloride (GaCl) produced with laser light tuned between 330 and 430 nm. The spectra originate from one, two, and three photon resonances with electronic states that reside between 29 500 and 80 000 cm-1. We have assigned five Rydberg series comprised of 20 new electronic states. Each state exhibits a short vibrational progression. A least-squares fit of the unperturbed Rydberg state origins yields the adiabatic ionization potential, IPa(GaCl)=80 540±10 cm-1. We have also identified bands that originate from one-photon resonances with the previously known a 3Π state. We conservatively estimate the REMPI detection sensitivity for GaCl to be 109 molecules cm-3 (laser pulse)-1.


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