Photoionization of atmospheric gases studied by time-resolved terahertz spectroscopy

被引：6

作者：

Mics, Zoltan ^{[1
]}

Kuzel, Petr ^{[1
]}

Jungwirth, Pavel ^{[2
]}

Bradforth, Stephen E. ^{[3
]}

机构：

[1] Acad Sci Czech Republ, Inst Phys, Prague 18221 8, Czech Republic

[2] Acad Sci Czech Republ, Inst Organ Chem & Biochem, Ctr Biomol & Complex Mol Syst, CR-16610 Prague 6, Czech Republic

[3] Univ So Calif, Dept Chem, Los Angeles, CA 90089 USA

来源：

CHEMICAL PHYSICS LETTERS | 2008年 / 465卷 / 1-3期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/j.cplett.2008.09.046

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：

We investigate the laser induced ionization and plasma formation in pure oxygen and nitrogen by means of optical pump-terahertz probe spectroscopy. Focused amplified femtosecond pulses at 405 and 810 nm are used to ionize the gas molecules by nonlinear processes. The ionized gas is probed by picosecond terahertz pulses in the frequency range of 0.2-2 THz to obtain the free electron density (10(13) - 10(17) cm (3)) and the electron scattering time (0.2 ps for N-2 and 0.4 ps for O-2). We demonstrate the importance of the centrifugal barrier for the photoionization process using circularly polarized light. (c) 2008 Elsevier B. V. All rights reserved.

引用

页码：20 / 24

页数：5

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