Nonlinear photoionization of supersonically expanded molecular pulses of iodomethane (CH3I)

被引:0
作者
Al-Basheer, Watheq [1 ]
机构
[1] King Fahd Univ Petr & Minerals, Dept Phys, Dhahran 31261, Saudi Arabia
来源
NONLINEAR OPTICS AND APPLICATIONS XII | 2021年 / 11770卷
关键词
Multiphoton Ionization; Cooled Molecular Pulses; Iodomethane; OPO laser; (R)-3-METHYLCYCLOPENTANONE CONFORMERS; TEMPERATURE; IONIZATION; SOLVENT;
D O I
10.1117/12.2589033
中图分类号
TM [电工技术]; TN [电子技术、通信技术];
学科分类号
0808 ; 0809 ;
摘要
In this paper, the ultraviolet output of frequency-doubled OPO laser at 266 nm was employed to obtain highly-resolved (2+1) resonance-enhanced multiphoton ionization (REMPI) and mass spectra of supersonically-expanded and jet-cooled molecular pulses of iodomethane. The molecular sample consisted of a 3% neat iodomethane gas dissolved in helium. The REMPI and mass spectra of iodomethane were obtained using a two meter time-of-flight (TOF) mass spectrometer coupled with a microchannel plate detector that was kept at 4K volts. The laser power density effect on the (2+1) REMPI process was also investigated by focusing and defocusing the laser pulses using 30 cm and 75 cm biconvex lenses, respectively. By monitoring I+ and CH3+ fragments, it was evident that 3 photons were involved in the REMPI process.
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页数:8
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