Threshold photoelectron studies of Kr and Xe

Slattery, Andrew; Wightman, J. P.; MacDonald, Michael A.; Cvejanović, S; Reddish, T J

doi:10.1088/0953-4075/33/21/325

Cited by 13 publications

(20 citation statements)

References 27 publications

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“…The satellite states populated during photoionization of Kr by synchrotron radiation have been studied extensively with high-resolution photoelectron spectroscopy [3][4][5][6][7][8]. There is a general agreement on state assignment, however the mechanisms leading to the population of these states are disputed, especially in the vicinity of photoionization thresholds [4,[6][7][8].…”

Section: Theoretical Methodologymentioning

confidence: 99%

“…In this work, we undertake a novel investigation of atomic ionization dynamics using monochromated high harmonic extreme ultraviolet (XUV) radiation and ultrafast strong-field near-infrared (NIR) pulses. Krypton is 4s −1 or 4p −1 photoionized, populating satellite states via the electron correlation [3][4][5][6][7][8]. Subsequent tunnel ionization [9, 10] of the satellites allows the relative photoexcitation populations and relative cross-sections to be recovered in a pump-probe configuration.…”

mentioning

confidence: 99%

“…(c) 4s −1 (red) and 4p −1 (green) photoionization partial cross sections as a function of photon energy from the respective thresholds of 13.99 and 27.50 eV. The cross-sections are an amalgamation of experimental and theoretical results[3][4][5][6][7][8] with the uncertainty indicated by the shaded area.…”

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confidence: 99%

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Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

et al. 2012

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Extreme ultraviolet (XUV) pulses with a duration of tens of femtoseconds initiate 4s −1 or 4p −1 photoionization of krypton, which populates highly excited satellite states through the electron correlation. The excited ions are then tunnel ionized to Kr 2+ 4s −1 4p −1 or 4p −2 by a strong-field nearinfrared (NIR) pulse of a similar duration. The XUV pulses are produced by high harmonic generation in a gas jet and we employ a state-of-the-art timepreserving monochromator to isolate individual XUV harmonic orders. An enhancement of the Kr 2+ yield as a function of harmonic photon energy and XUV-pump NIR-probe delay is observed and compared with a two-step model, which allows the population of the satellite states to be inferred. Furthermore, relative 4s and 4p satellite excitation cross-sections are predicted at the photon energies studied. This proof-of-principle experiment demonstrates that isolated harmonics can be employed to pump specific electronic states, which will be highly complementary to synchrotron, attosecond and x-ray free-electron laser studies of complex systems.In the solid state, ferromagnetism, magnetoresistance and superconductivity are mediated by electron correlation dynamics; on the atomic scale, this coupling is of vital significance to scattering or absorption, many chemical processes and fullerene formation. Narrowband synchrotron radiation is used to measure photon cross-sections as a function of energy from 10 eV to several keV with a typical resolution of a few thousand, allowing the influence of electron correlations to be observed. The Fourier analogue, time-resolved photoexcitation and detection, is now capable of tracking electron dynamics on the attosecond timescale [1,2]. Resolving transient states is the key characteristic, rather than absolute resolution, typically t/ t 5 fs/100 as. In this work, we undertake a novel investigation of atomic ionization dynamics using monochromated high harmonic extreme ultraviolet (XUV) radiation and ultrafast strong-field near-infrared (NIR) pulses. Krypton is 4s −1 or 4p −1 photoionized, populating satellite states via the electron correlation [3][4][5][6][7][8]. Subsequent tunnel ionization [9, 10] of the satellites allows the relative photoexcitation populations and relative cross-sections to be recovered in a pump-probe configuration. We show this unique simultaneous time-and energy-dependent measurement allows weak electron dynamics to be quantified, and is highly complementary to the studies of complex systems with synchrotron, attosecond and x-ray freeelectron laser (XFEL) sources [11][12][13][14][15].Depending on photon energy and flux, radiation absorption processes can be roughly categorized as linear (single photon) or nonlinear multiphoton. Synchrotron sources with a photon energy of tens to thousands of eV are an excellent probe of linear processes [8]. On the other hand, intense ultrafast lasers operating in the visible and NIR spectral regions can initiate nonlinear processes such as multiphoton and tunnel ionization, first theor...

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Section: Theoretical Methodologymentioning

confidence: 99%

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confidence: 99%

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Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

et al. 2012

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“…The apparatus has been previously used for (γ ,2e) studies [e.g. 28] and threshold photoelectron spectroscopy (TPES) [29,30]; b Predissociation lifetimes only, which are the dominant decay mechanism. However, when comparing with experimental values for the ν = 0 level, one should note that the lifetime is slightly shorter ( 0 wider) than calculated due to the fluorescence channel.…”

Section: Methodsmentioning

confidence: 99%

An angle-resolved dissociative photoionization study of the c⁴Σ⁻_ustate in O⁺₂using the TPEPICO technique

Padmanabhan

MacDonald

Ryan

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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“…2) were recorded at the VLS-PGM beamline [24], at the Canadian Light Source facility in Saskatoon, Canada, using a Double Toroidal Coincidence Spectrometer. The apparatus was described previously in detail [25] and a specific description of the operation in the threshold mode was also provided [26]. Although it was primarily designed to be used for measurements of noble gases and small, diatomic molecules, it was recently proven that it may also be used for measurements on more complicated systems, such as pyrimidine and of its heavier derivatives [27] or esters [28,29].…”

Section: Threshold and Photoelectron Spectramentioning

confidence: 99%

Photoelectron and threshold photoelectron valence spectra of pyridine

et al. 2016

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Abstract.The pyridine molecule has been examined by the means of photoelectron and threshold photoelectron spectroscopies. Ionization energies were determined for both outer and inner valence orbitals and new adiabatic values were also resolved. Vibronic structure associated with several states was assigned mainly to be due to C-C stretches and ring bends. Additionally a Rydberg state converging to 7b2 state was ascribed. The data shown here are in a good agreement with previous results and brings some new insights into the electronic structure of this biologically and astrochemically relevant and important molecule.

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Threshold photoelectron studies of Kr and Xe

Cited by 13 publications

References 27 publications

Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

An angle-resolved dissociative photoionization study of the c⁴Σ⁻_ustate in O⁺₂using the TPEPICO technique

Photoelectron and threshold photoelectron valence spectra of pyridine

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Threshold photoelectron studies of Kr and Xe

Cited by 13 publications

References 27 publications

Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

Isolated high-harmonic XUV photon absorption and NIR strong-field tunnel ionization

An angle-resolved dissociative photoionization study of the c4Σ−ustate in O+2using the TPEPICO technique

Photoelectron and threshold photoelectron valence spectra of pyridine

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An angle-resolved dissociative photoionization study of the c⁴Σ⁻_ustate in O⁺₂using the TPEPICO technique