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Citation: Yang Da-Lin, Ling Yun, Ding Chuan-Fan, Zhou You, Zhu Qi-He. Methyl Iodide Multiphoton Ionization Via Ã State or C State[J]. Acta Physico-Chimica Sinica, ;1993, 9(04): 442-446. doi: 10.3866/PKU.WHXB19930403 shu

Methyl Iodide Multiphoton Ionization Via Ã State or C State

1.
State Key Laboratory of Molecular Reaction Dynamics, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100080

Received Date: 22 March 1993
Available Online: 15 August 1993

The collision-free multiphoton ionization of jet cooling CH_3I was studied using a pulsed laser, tunable around 280 and 366 nm with TOF mass spectrometer and mag-netic-bottle TOF photoelectron spectrometer.
MPI of CH_3I in 280 nm region via valence Ã state can be explained by ladder-switch mechanism according to the following experimental results. The parent ions are almost abscent in the MPI TOF MS. I~+ MPI spectrum gives three resonances corre-sponding to two-photon excitation of I atom at 279.72, 279.25 and 278.50 nm. The I ionic state due to 2+1 REMPI of I atom can be assigned from the REMPI PES.
In 371—365 nm I~+, CH_3~+ and CH_3I~+ were observed in MPI MS. The mass-selected MPI spectra of CH_3I~+ and daughter ion I~+ have similar profiles. In the spectra the two peaks at 365.90 and 369.92 nm are assigned to be two-photon resonance with the Rydberg C state Π(0,0) and Σ(0,0) of CH_3I respectively. The formation of the CH_3I~+ ~2Π_(3/2) and ~2Π_(1/2) state created by 2+1 and 2+2 REMPI resectively were found in PES. REMPI of CH_3I around 366 nm is consistent with the ladder mechanism in which CH_3I is excited into C state upon a two photon absorption and parent ion is formed by the overall 2+1 of 2+2 MPI process. The fragment ions are produced by further dissociation of CH_3I~+ at Ã state.
- Methyl iodide; Multiphoton ionization; Multiphoton ionization spectroscopy; Photoelectron energy spectroscopy; Dissociation and ionization mechanism
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