Wavelength dependent photoelectron circular dichroism of limonene studied by femtosecond multiphoton laser ionization and electron-ion coincidence imaging

被引:29
作者
Fanood, Mohammad M. Rafiee [1 ,3 ]
Janssen, Maurice H. M. [1 ,4 ]
Powis, Ivan [2 ]
机构
[1] Vrije Univ Amsterdam, LaserLaB Amsterdam, Boelelaan 1081, NL-1081 HV Amsterdam, Netherlands
[2] Univ Nottingham, Sch Chem, Nottingham NG7 2RD, England
[3] Delft Univ Technol, Dept Imaging Phys, Lorentzweg 1, NL-2628 CJ Delft, Netherlands
[4] MassSpecpecD BV, Drienerbeeklaan 35, NL-7522 NA Enschede, Netherlands
基金
英国工程与自然科学研究理事会;
关键词
ENANTIOMERIC MONOTERPENE EMISSIONS; CHIRAL MOLECULES; HIGH-RESOLUTION; SPECTROSCOPY; PHOTOIONIZATION; ASYMMETRY; FENCHONE;
D O I
10.1063/1.4963229
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
Enantiomers of the monoterpene limonene have been investigated by (2 + 1) resonance enhanced multiphoton ionization and photoelectron circular dichroism employing tuneable, circularly polarized femtosecond laser pulses. Electron imaging detection provides 3D momentum measurement while electron-ion coincidence detection can be used to mass-tag individual electrons. Additional filtering, by accepting only parent ion tagged electrons, can be then used to provide discrimination against higher energy dissociative ionization mechanisms where more than three photons are absorbed to better delineate the two photon resonant, one photon ionization pathway. The promotion of different vibrational levels and, tentatively, different electronic ion core configurations in the intermediate Rydberg states can be achieved with different laser excitation wavelengths (420 nm, 412 nm, and 392 nm), in turn producing different state distributions in the resulting cations. Strong chiral asymmetries in the lab frame photoelectron angular distributions are quantified, and a comparison made with a single photon (synchrotron radiation) measurement at an equivalent photon energy. Published by AIP Publishing.
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收藏
页数:12
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