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Ultrafast dynamics of autoionizing states in O2 probed by laser-field-assisted XUV photoionization

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Title
Ultrafast dynamics of autoionizing states in O2 probed by laser-field-assisted XUV photoionization
Author(s)
Zhu C.; Dong Hyuk Ko; Kyung Sik Kang; Jisu Lee; Jae-hwan Lee; Umesh G.; Krishnakumar E.; Chang Hee Nam
Publication Date
2013-10
Journal
PHYSICAL REVIEW A, v.88, no.4, pp.043419-1 - 043419-5
Publisher
AMER PHYSICAL SOC
Abstract
Dynamics of the autoionizing states in O2 was investigated using the method of laser-field-assisted extreme-ultraviolet photoionization. Harmonics, ranging from 9th to 21st orders generated in Kr with 25 fs laser pulses at 820 nm, were employed to carry out photoionization of O2. Distinct autoionization features in the photoelectron spectrum, stemming from the resonant excitation of superexcited states of O2 by the 11th harmonic, were observed. The superexcited states, referred to as autoionizing states, were identified to be the ν′ = 0, n = 5 Rydberg states converging to the b 4Σg - state of O 2 +. Infrared laser pulses were utilized as the probe to monitor time-varying characteristics of photoionization and autoionization of O2. A decay time of 21 fs was obtained for the autoionizing states of O2 by deconvoluting the pump-probe results in O2 and Ar. © 2013 American Physical Society.
URI
http://pr.ibs.re.kr/handle/8788114/1570
DOI
10.1103/PhysRevA.88.043419
ISSN
1050-2947
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > Journal Papers (저널논문)
Files in This Item:
2013-10-16-Physical Review A-UltrafastDynamicsofAutoinoizing.pdfDownload

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