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Zeitschrift für Physikalische Chemie

International journal of research in physical chemistry and chemical physics

Editor-in-Chief: Rademann, Klaus


IMPACT FACTOR 2018: 0.975
5-year IMPACT FACTOR: 1.021

CiteScore 2018: 1.20

SCImago Journal Rank (SJR) 2018: 0.327
Source Normalized Impact per Paper (SNIP) 2018: 0.391

Online
ISSN
2196-7156
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Volume 229, Issue 10-12

Issues

Photoionization Yields in Intense fs-Laser Fields – A Systematic Investigation of Chirp Effects

Nicola Reusch / Steffen Griebe / Johannes Karges / Karl-Michael Weitzel
Published Online: 2015-07-10 | DOI: https://doi.org/10.1515/zpch-2015-0634

Abstract

The femtosecond laser ionization of several small hydrocarbon molecules (methane, ethane, propane) has been investigated as a function of the second order spectral phase (linear chirp) of laser pulses centered at λ = 807 nm. Ion yields are demonstrated to depend markedly on the linear chirp parameter. At laser intensities exceeding 5 · 1014 W/cm2 the ionization characteristics resemble an intensity-driven process, i.e. the largest ion yield is observed for a close to transform-limited laser pulse. For smaller laser intensities a pronounced sign effect in the chirp dependence appears, i.e. the maximum ion yield is observed for a negative linear chirp parameter of several hundred to thousand fs2. We suggest that this sign effect is connected to the anharmonicity of the electronic potentials involved. This suggestion is supported by the fact that basically no sign effect in the chirp dependence is observed for the noble gases argon, krypton and xenon. We further suggest that the electronic polarizability and structure plays some role as methanol does not show a marked sign-dependent chirp effect.

Keywords: Ionization Dynamics; Spectral Phase; Linear Chirp Parameter

Acknowledgement

Nicola Reusch acknowledges financial support from the Fonds der Chemischen Industrie. Technical assistance by Vivane Heddinga is gratefully acknowledged.

About the article

Accepted: 2015-06-18

Received: 2015-04-22

Published Online: 2015-07-10

Published in Print: 2015-10-28


Citation Information: Zeitschrift für Physikalische Chemie, Volume 229, Issue 10-12, Pages 1729–1746, ISSN (Online) 2196-7156, ISSN (Print) 0942-9352, DOI: https://doi.org/10.1515/zpch-2015-0634.

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