(2+1) Resonance-enhanced multiphoton ionization (REMPI) and (2+1 ') mass-analyzed threshold ionization (MATI) spectroscopy of H2O

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Rotationally resolved MATI spectra of H2O, recorded using two-colour (2 + 1′) multiphoton excitation via the C̃ state, are reported. The spectroscopy provides a possible route to clean state-selection of rovibronic levels of the H2O+ ion. The rotational line intensities observed in the spectra are discussed in relation to previous photoelectron spectra and theoretical calculations. The observation of intense ΔKa = even transitions is attributed to a large contribution to the transition moment from an nf←nd component. Room temperature and jet-cooled (2 + 1) REMPI spectra of H2O are also reported for the region 80000–92000 cm−1. These involve two-photon transitions from the ground X̃ 1A1 state to various vibrational levels of the C̃ 1B1, D̃̃′ 1B1 and D̃̃″ 1A2 states as well as the first linear 1B2 state.


Original languageEnglish
Pages (from-to)4669-4675
Number of pages7
JournalPhysical Chemistry Chemical Physics
Issue number20
Publication statusPublished - 28 Sep 2000