Autoionizing states in argon (Electron scattering)

McConkey, J W; Preston, J. A.

doi:10.1088/0022-3700/6/6/004

Cited by 12 publications

(6 citation statements)

References 8 publications

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“…However, such states can be accessed by two photon (XUV þ NIR) processes. In particular, the 3s3p 6 4d (28.3 eV) state lies 1.7 eV above the 3s3p 6 4p state [23], which is within the spectral range of the few-cycle NIR pulse (1.3-2.1 eV) and is approximately equal to the central photon energy of the NIR laser pulse. When the two states are strongly coupled by the NIR laser, as is shown in Fig.…”

Section: Prl 105 143002 (2010) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 81%

“…[9,10], the coupled equations for the time-dependent amplitudes c a ðtÞ and c b ðtÞ were solved. The XUV and NIR laser pulse durations and intensities were chosen to be the same as in the experiment, and the energies, widths, and q parameters of the autoionizing states were taken from the literature (q a ¼ À0:2, q b ¼ 2:43) [4,23]. The dipole matrix elements hgjzjai and hajzjbi were calculated to be 0.027 and 1.54 a.u., respectively, using single particle wave functions calculated with an effective Coulomb potential [25].…”

Section: Prl 105 143002 (2010) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

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Attosecond Time-Resolved Autoionization of Argon

et al. 2010

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Autoionization of argon atoms was studied experimentally by transient absorption spectroscopy with isolated attosecond pulses. The peak position, intensity, linewidth, and shape of the 3s3p 6 np 1 P Fano resonance series (26.6-29.2 eV) were modified by intense few-cycle near infrared laser pulses, while the delay between the attosecond pulse and the laser pulse was changed by a few femtoseconds. Numerical simulations revealed that the experimentally observed splitting of the 3s3p 6 4p 1 P line is caused by the coupling between two short-lived highly excited states in the strong laser field. DOI: 10.1103/PhysRevLett.105.143002 PACS numbers: 32.70.Jz, 32.80.Zb, 78.47.JÀ Bridging the gap between atomic physics and the complex systems that make up the world around us requires indepth study of electron correlation. While rotation and vibration of molecules can be studied by femtosecond lasers [1], observation of the electron-electron interaction requires attosecond time resolution [2]. One of the most interesting processes governed by electron-electron correlation is autoionization [3]. The Fano profile, which is the signature of the autoionization process, has widespread significance in many scientific disciplines [4][5][6][7]. For decades, spectral-domain measurements with synchrotron radiation have served as a window into the rich dynamics of autoionization [4]. However, the synchrotron pulse duration is too long (100 fs to 100 ps) to time-resolve the Fano resonances since the autoionization lifetimes can be as short as a few femtoseconds.Since the generation of the first isolated attosecond pulses in 2001 [8], it was theoretically proposed [9][10][11][12][13] and experimentally demonstrated [14] that time-resolved Fano profiles can be studied using the attosecond streaking technique. To date, most theoretical and experimental investigations of autoionization processes have scrutinized Fano profiles as a function of the photoelectron energy. However, made possible by significant recent progress in short-pulse laser technology [15], timeresolved transient XUV photoabsorption measurements have become feasible, which gives access to complimentary studies of atomic autoionization in the time regime [16,17]. Photoabsorption measurements typically have higher data collection efficiency and better energy resolution than what can be obtained by detecting photoelectrons. The setup is all-optical, much simpler than the attosecond streak camera. Here we demonstrate the first transient absorption experiment using isolated attosecond pulses to probe the autoionization of atoms and show that the autoionization process is strongly modified by an intense laser field.Fano resonance profiles in the absorption spectrum are the result of interference between the direct ionization and the decay from an autoionizing state due to configuration interaction [3]. It is characterized by the resonance energy E r , its width that is related to the lifetime of the autoionizing state by ¼ @=À, and the q parameter, which represents the ratio...

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Section: Prl 105 143002 (2010) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 81%

Section: Prl 105 143002 (2010) P H Y S I C a L R E V I E W L E T T Ementioning

confidence: 99%

Attosecond Time-Resolved Autoionization of Argon

et al. 2010

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“…However, such states can be accessed by two photon (XUV+NIR) processes. In particular, the 3s3p 6 4d (28.3 eV) state lies 1.7 eV above the 3s3p 6 4p state, 57 which is within the spectral range of the few-cycle NIR pulse (1.3 eV to 2.1 eV) and is approximately equal to the central photon energy of the NIR laser pulse. When the two states are strongly coupled by the NIR laser, as shown in Figs.…”

Section: Time Resolved Spectroscopy Study Of Argonmentioning

confidence: 82%

“…The XUV and NIR laser pulse durations and intensities were chosen to be the same as in the experiment, and the energies, widths, and q parameters of the autoionizing states were taken from the literature (q a = − 0.2, q b = 2.43). 50,57 The dipole matrix elements g|z|a and g|z|g were calculated to be 0.027 and 1.54 a.u., respectively, using single particle wavefunctions calculated with an effective Coulomb potential. 78 The single-atom dipole radiation spectrum is given by: where d(t) is the dipole matrix element…”

Section: Time Resolved Spectroscopy Study Of Argonmentioning

confidence: 99%

Attosecond Pulse Generation, Characterization and Application

Chen¹,

Gilbertson²,

Wang³

et al. 2011

Advances in Multi-Photon Processes and Spectroscopy

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“…The calibration was performed by measuring absorption lines corresponding to argon 3s3p 6 np autoionizing states and helium 1snp excited states, with known photon energies lying between 20 and 30 eV. Furthermore, the argon autoionization lines with well-known Fano lineshapes [12,13] were used to determine the energy resolution of the spectrometer.…”

Section: Introductionmentioning

confidence: 99%

In situ calibration of an extreme ultraviolet spectrometer for attosecond transient absorption experiments

et al. 2013

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We report a method for calibrating an extreme ultraviolet spectrometer based on a flat-field grazing incidence spherical grating in the energy range of 20-30 eV. By measuring absorption lines corresponding to singly excited states in helium atoms and autoionizing states in argon atoms, the photon energy of the detected light was determined. The spectral resolution of the spectrometer, 60 meV, was obtained by deconvolving the Fano resonance profile of argon autoionizing states from the measured absorption line profiles.

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Autoionizing states in argon (Electron scattering)

Cited by 12 publications

References 8 publications

Attosecond Time-Resolved Autoionization of Argon

Attosecond Time-Resolved Autoionization of Argon

Attosecond Pulse Generation, Characterization and Application

In situ calibration of an extreme ultraviolet spectrometer for attosecond transient absorption experiments

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