REAL-TIME OPTICAL SPECTROSCOPY OF VACUUM ULTRAVIOLET IRRADIATED PYRENE: H2O INTERSTELLAR ICE

被引：44

作者：

Bouwman, J. ^{[1
]}

Paardekooper, D. M. ^{[1
]}

Cuppen, H. M. ^{[1
]}

Linnartz, H. ^{[1
]}

Allamandola, L. J. ^{[2
]}

机构：

[1] Leiden Univ, Raymond & Beverly Sackler Lab Astrophys, Leiden Observ, NL-2300 RA Leiden, Netherlands

[2] NASA, Ames Res Ctr, Div Space Sci, Moffett Field, CA 94035 USA

来源：

ASTROPHYSICAL JOURNAL | 2009年 / 700卷 / 01期

关键词：

astrochemistry; ISM: molecules; methods: laboratory; molecular processes; POLYCYCLIC AROMATIC-HYDROCARBONS; YOUNG STELLAR OBJECTS; RADICAL CATIONS; ELECTRONIC-SPECTRA; FACILE GENERATION; HYDROGEN-ATOMS; UV PHOTOLYSIS; WATER-ICES; GAS; NAPHTHALENE;

D O I：

10.1088/0004-637X/700/1/56

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

This paper describes a near-UV/VIS study of a pyrene: H2O interstellar ice analogue at 10 K using optical absorption spectroscopy. A new experimental approach makes it possible to irradiate the sample with vacuum ultraviolet (VUV) light (7-10.5 eV) while simultaneously recording spectra in the 240-1000 nm range with subsecond time resolution. Both spectroscopic and dynamic information on VUV processed ices are obtained in this way. This provides a powerful tool to follow, in situ and in real time, the photophysical and photochemical processes induced by VUV irradiation of a polycyclic aromatic hydrocarbon containing inter- and circumstellar ice analogue. Results on the VUV photolysis of a prototype sample-strongly diluted pyrene in H2O ice-are presented. In addition to the pyrene cation (Py+), other products-hydroxypyrene (PyOH), possibly hydroxypyrene cation (PyOH+), and pyrene/pyrenolate anion (Py-/PyO-)-are observed. It is found that the charge remains localized in the ice, also after the VUV irradiation is stopped. The astrochemical implications and observational constraints are discussed.

引用

页码：56 / 62

页数：7

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