INFRARED SPECTRA OF ISOLATED PROTONATED POLYCYCLIC AROMATIC HYDROCARBON MOLECULES

被引：99
作者：
Knorke, Harald [1 ]
Langer, Judith [1 ]
Oomens, Jos [2 ,3 ]
Dopfer, Otto [1 ]
机构：
[1] Tech Univ Berlin, Inst Opt & Atomare Phys, D-10623 Berlin, Germany
[2] FOM Inst Plasma Phys, NL-3430 BE Nieuwegein, Netherlands
[3] Univ Amsterdam, NL-1018 WV Amsterdam, Netherlands
来源：
ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 706卷 / 01期
关键词：
astrochemistry; infrared: ISM; ISM: molecules; methods: laboratory; molecular data; techniques: spectroscopic; EMISSION BANDS; IR-SPECTRA; SPECTROSCOPY; CATIONS; BENZENIUM; FACILITY; FEATURES; CARRIERS; PAHS; IONS;
D O I：
10.1088/0004-637X/706/1/L66
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
Gas-phase infrared (IR) spectra of larger protonated polycyclic aromatic hydrocarbon molecules, H(+)PAH, have been recorded for the first time. The ions are generated by electrospray ionization and spectroscopically assayed by IR multiple-photon dissociation (IRMPD) spectroscopy in a Fourier transform ion cyclotron resonance mass spectrometer using a free electron laser. IRMPD spectra of protonated anthracene, tetracene, pentacene, and coronene are presented and compared to calculated IR spectra. Comparison of the laboratory IR spectra to an astronomical spectrum of the unidentified IR emission (UIR) bands obtained in a highly ionized region of the interstellar medium provides for the first time compelling spectroscopic support for the recent hypothesis that H(+)PAHs contribute as carriers of the UIR bands.
引用
收藏
页码：L66 / L70
页数：5
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