title: Photodissociation spectroscopy of CD3I+ generated by mass-analyzed threshold ionization for structure determination.
abstract: A method is devised better to resolve the subbands of the ground vibronic band in the mass-analyzed threshold ionization (MATI) spectrum of CD(3)I. By selective photodissociation of CD(3)I(+) in these subbands, high-resolution spectra for the A(2)A(1)<--X(2)E(3/2) transition are recorded. Spectral analysis confirms our previous suggestion that these subbands are due to cations in different rotational K states; this demonstrates the capability of MATI to generate rovibronically selected ion beams. By using the rotational constants of CH(3)I(+) and CD(3)I(+) obtained by spectral analysis, the zero-point-level geometries of the cations in the X(2)E(3/2) and A(2)A(1) states are determined. To the best of our knowledge, this is the first time that the capability of MATI-PD to determine the geometry of a gas-phase polyatomic cation in an excited electronic state is demonstrated.
authors.affiliation: Department of Chemistry, Seoul National University, Seoul 157-742, Korea.
authors.forename: Yong Jin
authors.initials: YJ
authors.lastname: Bae
authors.forename: Myung Soo
authors.initials: MS
authors.lastname: Kim
mesh_terms: D002244:Carbon / Q000737:chemistry*; D003903:Deuterium; D017613:Iodine Compounds / Q000737:chemistry*; D010777:Photochemistry; D017785:Photons; D021241:Spectrometry, Mass, Electrospray Ionization; D013057:Spectrum Analysis
chemical_list: D017613:Iodine Compounds; D002244:Carbon; D003903:Deuterium