2015
DOI: 10.1088/0953-4075/48/12/125601
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Investigation of coupling mechanisms in attosecond transient absorption of autoionizing states: comparison of theory and experiment in xenon

Abstract: Attosecond transient absorption spectra near the energies of autoionizing states are analyzed in terms of the photon coupling mechanisms to other states. In a recent experiment, the autoionization lifetimes of highly excited states of xenon were determined and compared to a simple expression based on a model of how quantum coherence determines the decay of a metastable state in the transient absorption spectrum. Here it is shown that this procedure for extracting lifetimes is more general and can be used in ca… Show more

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Cited by 17 publications
(16 citation statements)
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“…It should be noted that the decay timescales observed here are faster than the autoionization lifetimes due to NIR pulse induced broadening of resonances [60]. Fitting a convolution of Gaussian and exponential decay to the evolution of 5d, 6s (ν = 0) signals, we obtain a decay timescale ∼60 fs, corresponding to a net line width of ∼11 meV.…”
Section: Comparison Of Experimental and Mctdhf Spectrogramsmentioning
confidence: 72%
“…It should be noted that the decay timescales observed here are faster than the autoionization lifetimes due to NIR pulse induced broadening of resonances [60]. Fitting a convolution of Gaussian and exponential decay to the evolution of 5d, 6s (ν = 0) signals, we obtain a decay timescale ∼60 fs, corresponding to a net line width of ∼11 meV.…”
Section: Comparison Of Experimental and Mctdhf Spectrogramsmentioning
confidence: 72%
“…The control pulse also repopulates state |ν = 2 R considerably when t = 1.0 and 5.0 fs, which explains the significance of the peak in the spectra shown in Fig. 4 Let us turn to x-ray transient absorption spectra (XTAS) to trace the nuclear dynamics studied above, similarly as done in conventional transient absorption spectroscopy [34,35]. In particular, we consider here the XTAS as a tool to monitor the core-excited wave packet.…”
Section: Numerical Resultsmentioning
confidence: 99%
“…In particular, we consider here the XTAS as a tool to monitor the core-excited wave packet. expressed as [33][34][35] …”
Section: Numerical Resultsmentioning
confidence: 99%
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“…Nevertheless, attosecond transient absorption (ATA) with collinear XUV pump and optical or near infrared (NIR) probe pulses can be described as a self-heterodyned nonlinear spectroscopy [12]. These measurements provide evidence of four-wave mixing interactions in the form of quantum beat oscillations [22][23][24][25][26], but they lack the selectivity of higher-order wave-mixing techniques to disentangle complex spectra [27]. Capitalizing on the phasematching conditions inherent in wave-mixing processes, recent experiments employed a noncollinear beam geometry between an XUV attosecond pulse train and either one [28,29] or two [30][31][32] moderately intense NIR pulses to measure transient spectra of spatially isolated XUV wave-mixing signals.…”
Section: Introductionmentioning
confidence: 99%