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(2 + 1) REMPI spectra of the i2-Kr and i2-N2 van der Waals complexes and the (2 + 1′) ZEKE-PFI photoelectron spectrum of i2 +-Kr

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JournalJournal of the Chemical Society - Faraday Transactions
DatePublished - 1 Jan 1997
Issue number24
Volume93
Number of pages7
Pages (from-to)4245-4251
Original languageEnglish

Abstract

We present the (2 + 1) mass-resolved resonance-enhanced multiphoton ionisation (REMPI) spectrum of the [23/2]c5d;Ωg (Ω = 0,2) Rydberg states of the I2-Kr van der Waals complex. Anharmonic progressions in the I2⋯Kr van der Waals stretching mode have been observed with ω̃e values of 49 ± 2 and 47 ± 2 cm-1 for the [23/2]c5d;Ω = 0g and [23/2]c5d;Ω = 2g states, respectively. The [23/2]c5d;Ω = 2g state of I2-Kr has been used as an intermediate in a two-colour (2 + 1′) zero kinetic energy pulsed-field ionisation (ZEKE-PFI) photoelectron study of the X̃23/2, g state of the I2 +-Kr ionic complex. The adiabatic ionisation energy was determined to be 74248 ±3 cm-1. An anharmonic vibrational progression in the I2 +⋯Kr van der Waals stretching mode was observed giving a value of ω̃c = 55 ± 2 cm-1 for the X̃23/2, g state of the complex. The [21/2]c6s;Ω = 1g Rydberg state of the I2-N2 van der Waals complex has also been observed using REMPI spectroscopy. Anharmonic progressions in the I2⋯N2 van der Waals stretching mode have been observed with ω̃e = 71 ± 2 cm-1. Comparisons are made between the spectroscopic data obtained for the Rydberg states of I2-Kr and I2-N2 with the analogous Rydberg states in I2-Ar.

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