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Akiyoshi Hishikawa
Nagoya University
IonAtomic physicsChemistryLaserCoulomb explosion
85Publications
18H-index
1,030Citations
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Publications 86
Newest
#1Tomoyuki EndoH-Index: 3
#2Hikaru FujiseH-Index: 2
Last. Akiyoshi HishikawaH-Index: 18
view all 8 authors...
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#1Mizuho Fushitani (Nagoya University)H-Index: 10
#2Y. Toida (Nagoya University)H-Index: 1
Last. Akiyoshi Hishikawa (Nagoya University)H-Index: 18
view all 4 authors...
The ultrafast dynamics of molecular nitrogen (N2) just below the ionization threshold has been investigated by time-resolved photoelectron spectroscopy using a single harmonic centered at hν = 15.38 eV. The evolution of the Rydberg wavepacket launched by the ultrashort EUV pulse is probed by a time-delayed femtosecond NIR laser pulse. The observed photoelectron spectra show two series of vibrational peaks to the ground X2Σg+ state and the first excited A2Πu state of N2+. Among these, two photoel...
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#1Chien-Ming Tseng (NCTU: National Chiao Tung University)H-Index: 2
#2Mizuho Fushitani (Nagoya University)H-Index: 10
Last. Akiyoshi Hishikawa (Nagoya University)H-Index: 18
view all 4 authors...
Abstract Ion-coincidencemomentum imaging of Coulomb explosion of formaldehyde (H 2 CO)in femtosecond intense laser fields (800 nm, 1.3 × 10 15 W/cm 2 ) is performed with two different laser pulse durations (7 fs and 35 fs). In the 7-fs laser fields, the full fragmentation pathway from H 2 CO 4+ →H + + H + + C + + O + is identified. The angles between the fragment momentaare well reproduced by a simple Coulomb explosion model from the geometry of neutral formaldehyde, showing that the molecular s...
1 CitationsSource
#1Akitaka MatsudaH-Index: 14
#2Takahiro HayashiH-Index: 18
Last. Akiyoshi HishikawaH-Index: 18
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Photochemical reactions of gaseous ethylene in femtosecond laser filaments are studied. It is shown that hydrogenated amorphous carbon (a-C:H) films and nanoparticles are produced by the strong interactions with the intense laser fields (~1013 W/cm2). The laser field intensity is found to be an important parameter to determine the sp2/sp3 carbon ratio of the films and the size and number of nanoparticles.
1 CitationsSource
#1Tomoyuki Endo (Nagoya University)H-Index: 3
#2Hikaru Fujise (Nagoya University)H-Index: 2
Last. Akiyoshi Hishikawa (Nagoya University)H-Index: 18
view all 8 authors...
Selective bond breaking of CO2 in phase-locked ω–2ω two-color intense laser fields (λ = 800 nm and 400 nm, total field intensity I ∼ 1014 W cm−2) has been investigated by coincidence momentum imaging. The CO+ and O+ fragment ions produced by two-body Coulomb explosion, CO22+ → CO+ + O+, exhibit asymmetric distributions along the laser polarization direction, showing that one of the two equivalent C–O bonds is selectively broken by the laser fields. At a field intensity higher than 2 × 1014 W cm−...
6 CitationsSource
Last. Akiyoshi HishikawaH-Index: 18
view all 10 authors...
#1Tomoyuki EndoH-Index: 3
#2Hikaru FujiseH-Index: 2
Last. Akiyoshi HishikawaH-Index: 18
view all 8 authors...
We present applications of extreme ultraviolet (XUV) single-order laser harmonics to gas-phase ultrafast photoelectron spectroscopy. Ultrashort XUV pulses at 80 nm are obtained as the 5th order harmonics of the fundamental laser at 400 nm by using Xe or Kr as the nonlinear medium and separated from other harmonic orders by using an indium foil. The single-order laser harmonics is applied for real-time probing of vibrational wavepacket dynamics of I2 molecules in the bound and dissociating low-ly...
2 CitationsSource
#1Tomoyuki Endo (Nagoya University)H-Index: 3
#2Akitaka Matsuda (Nagoya University)H-Index: 14
Last. Akiyoshi Hishikawa (Nagoya University)H-Index: 18
view all 7 authors...
Tunneling-ionization imaging of photoexcitation of NO has been demonstrated by using few-cycle near-infrared intense laser pulses (8 fs, 800 nm, 1.1×10^{14} W/cm^{2}). The ion image of N^{+} fragment ions produced by dissociative ionization of NO in the ground state, NO (X^{2}Π,2π)→NO^{+}+e^{-}→N^{+}+O+e^{-}, exhibits a characteristic momentum distribution peaked at 45° with respect to the laser polarization direction. On the other hand, a broad distribution centered at ∼0° appears when the A^{2...
16 CitationsSource
#1Chien-Nan Liu (FJU: Fu Jen Catholic University)H-Index: 8
#2Toru Morishita (University of Electro-Communications)H-Index: 19
Last. Akiyoshi Hishikawa (Nagoya University)H-Index: 18
view all 4 authors...
We theoretically investigate the laser-assisted photoionization of He by an extreme ultra violet (XUV) pulse in the presence of a linearly chirped intense laser pulse by solving the time-dependent Schrodinger equation within the single-active-electron approximation. Analysis based on the time-dependent perturbation theory is also carried out to provide more physical insights. A new scheme is shown to be capable of extracting the arrival time of an XUV free-electron laser (FEL) pulse relative to ...
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