Atomic delay in helium, neon, argon and krypton

被引：92

作者：

Palatchi, Caryn ^{[1
]}

Dahlstrom, J. M. ^{[2
,3
,4
,5
]}

Kheifets, A. S. ^{[5
]}

Ivanov, I. A. ^{[5
]}

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

Agostini, P. ^{[1
]}

DiMauro, L. F. ^{[1
]}

机构：

[1] Ohio State Univ, Dept Phys, Columbus, OH 43210 USA

[2] Stockholm Univ, AlbaNova Univ Ctr, Dept Phys, SE-10691 Stockholm, Sweden

[3] Max Planck Inst Phys Komplexer Syst, D-01187 Dresden, Germany

[4] Ctr Free Electron Laser Sci, D-22761 Hamburg, Germany

[5] Australian Natl Univ, Res Sch Phys & Engn, Canberra, ACT 0200, Australia

来源：

JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS | 2014年 / 47卷 / 24期

基金：

澳大利亚研究理事会; 瑞典研究理事会;

关键词：

attosecond; delay; photoionization; PHOTOIONIZATION; AR;

D O I：

10.1088/0953-4075/47/24/245003

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

Photoionization by an eXtreme UltraViolet (XUV) attosecond pulse train (APT) in the presence of an infrared pulse (RABBITT method) conveys information about the atomic photoionization delay. By taking the difference of the spectral delays between pairs of rare gases (Ar,He), (Kr,He) and (Ne,He) it is possible to eliminate in each case the larger group delay ('attochirp') associated with the APT itself and obtain the Ar, Kr and Ne Wigner delays referenced to model calculations of the He delay. In this work we measure how the delays vary as a function of XUV photon energy but we cannot determine the absolute delay difference between atoms due to lack of precise knowledge of the initial conditions. The extracted delays are compared with several theoretical predictions and the results are consistent within 30 as over the energy range from 10 to 50 eV. An 'effective' Wigner delay over all emission angles is found to be more consistent with our angle-integrated measurement near the Cooper minimum in Ar. We observe a few irregular features in the delay that may be signatures of resonances.

引用

页数：7