2014
DOI: 10.1103/physreva.90.023405
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Resonance-like enhancement in high-order above-threshold ionization of formic acid

Abstract: We have investigated the high-order above-threshold ionization (HATI) spectrum of formic acid by means of high-resolution electron spectroscopy using 800-nm femtosecond laser light. The resonance-like enhancement structures in the HATI spectrum are shown to be experimentally reproducible and three enhancement-suppression patterns are observed in different energy regimes with increasing laser intensity. We simulated these patterns successfully by computing the exact solution of time-dependent Schrödinger equati… Show more

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Cited by 24 publications
(19 citation statements)
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“…The metal targets are prepared by heating the sample in an effusive source oven mounted below the interaction region. Laser intensities were calibrated by the 10U p cutoff in photoelectron spectrum of noble gases [31,45,46]. The experimental intensities in some cases are slightly scaled (≤ 20% from the calibration) to achieve best fit to the theoretical ion yield curves.…”
Section: Methodsmentioning
confidence: 99%
“…The metal targets are prepared by heating the sample in an effusive source oven mounted below the interaction region. Laser intensities were calibrated by the 10U p cutoff in photoelectron spectrum of noble gases [31,45,46]. The experimental intensities in some cases are slightly scaled (≤ 20% from the calibration) to achieve best fit to the theoretical ion yield curves.…”
Section: Methodsmentioning
confidence: 99%
“…Recently, the enhancement of polyatomic molecules was observed [16] [17]. Theoretical calculations using the SFA reproduced the experimental results and attributed the different characteristics of different molecules to interference effects of molecular orbitals with different symmetries [16], which, in fact, supported the channel closing mechanism.…”
Section: Introductionmentioning
confidence: 71%
“…While the enhancement in the high-energy ATI spectra of rare-gas atoms do not have a unified theoretical interpretation yet, experimental observations of such enhancements were reported in simple molecules [14] [15]. Recently, the enhancement of polyatomic molecules was observed [16] [17]. Theoretical calculations using the SFA reproduced the experimental results and attributed the different characteristics of different molecules to interference effects of molecular orbitals with different symmetries [16], which, in fact, supported the channel closing mechanism.…”
Section: Introductionmentioning
confidence: 99%
“…In 2003, Grasbon et al [11] discovered that RLEs are pronounced in multi-cycle laser pulses and will be suppressed in few-cycle pulses. Recently, the RLEs were also observed experimentally in the molecular system including H 2 [12], N 2 [13], formic acid [14], the polyatomic molecules C 2 H 4 and C 2 H 6 [15]. RLEs are very sensitive to the laser intensity, and only a few percent increases in the laser intensity will result in the ATI peaks on the plateau being enhanced by up to an order of magnitude.…”
mentioning
confidence: 86%