Generation of Ar_nH_3~+ cluster ions by laser vaporization and their black-body radiation induced dissociation

摘要

Ar_n~+H_3 ions are produced in a laser vaporization source,and their stability against black-body radiation is tested in an FT-ICR mass spectrometer.Using a magnesium target and hydrogen doped argon as carrier gas,Ar_n~+H_3 are formed with n=1-3 in large quantities and traces of n=4.Ar_n~+H,n=1-3 are also present.Both Ar_3~+H_3 and Ar_2~+H_3 are heated by room temperature black-body radiation and decay on a timescale of seconds.The observed rate constants are compared with recently calculated IR spectra.The results are in agreement with the presence of strong IR absorptions around 350 cm~(-1),which may serve as a fingerprint for the identification of H_3~+ in solid argon.