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Volume 43, Issue 12
Special Issue on Application of High-Order Harmonics to Time-Resolved Spectroscopy
Displaying 1-7 of 7 articles from this issue
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Special Issue on Application of High-Order Harmonics to Time-Resolved Spectroscopy
Special Issue
Laser Review
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Katsumi MIDORIKAWA2015 Volume 43 Issue 12 Pages 816-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSDownload PDF (206K) -
Ultarafast Photoelectron Spectroscopy of Molecular Wavepacket Dynamics by Laser High-Order HarmonicsMizuho FUSHITANI, Akiyoshi HISHIKAWA2015 Volume 43 Issue 12 Pages 818-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSLaser high-order harmonics in the extreme ultraviolet (EUV) and soft X-ray region serve as a unique tool to study ultrafast molecular dynamics associated with valence or inner-shell electron excitations. The harmonics are often obtained as a train of pulses, which result in a spectrum with a comb consisting of the odd harmonic orders. However, it is often the case that isolated pulses rather than pulse trains are preferred in the conventional pump-probe spectroscopy, to avoid signal overlaps associated with different harmonic orders. Here we review our approach for the single-order harmonics generation in EUV by using dielectric multilayer mirrors and metal foils, and the application to photoelectron spectroscopy on wavepacket dynamics of simple molecules such as Br2, I2 and N2.View full abstractDownload PDF (1027K) -
Yasuo NABEKAWA, Yusuke FURUKAWA, Tomoya OKINO, Kaoru YAMANOUCHI, K ...2015 Volume 43 Issue 12 Pages 823-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSWe observed the ultrafast dynamic evolution of vibrational wave packets generated in the ground electronic state of a D2 +/H2 + ion using a pair of attosecond pulse trains (APTs), formed with the high- (7th-order and higher) and low- (5th-order and lower) order harmonic fields of a sub-15 fs Ti:sapphire laser pulse. The kinetic energy release spectrum of the fragment ions of D+/H+ exhibited a twodimensional spectrogram of the wave packet by scanning the delay between the two APTs in the pair. Due to the simplicity of the one-photon excitation for the fragmentation in the probe process, we developed a novel method by mimicking the frequency-resolved optical gating technique to retrieve the complex wave packet amplitudes at ionization. The retrieved amplitude exhibited a nontrivial phase modulation, which can be interpreted as a ~1 fs settling time of the vibrational wave packet at ionization.View full abstractDownload PDF (883K) -
Shunsuke ADACHI2015 Volume 43 Issue 12 Pages 828-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSTime-resolved photoelectron imaging with 90-nm vacuum-ultraviolet harmonic pulses is applied to various targets from a basic atom to an organic molecule. We observed the quantum beat by the coherent excitation of the multiple Rydberg states of Kr. The first real-time study on CO2 photodissociation dynamics reveals two mechanisms with different dissociation rates. The spectroscopic observation of ground-state product formation in the 1,3-cyclohexadiene ring-opening reaction resolves the discrepancy between the reported values for the liquid and gas phases.View full abstractDownload PDF (1372K) -
Time-Resolved Photoelectron Spectroscopy of Gaseous Molecule Using Single-Order High Harmonic PulsesTaro SEKIKAWA, Ryo IIKUBO, Yu HARABUCHI, Sota SATOH, Tetsuya TAKE ...2015 Volume 43 Issue 12 Pages 833-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSCharacteristics of a time-delay compensated monochromator (TDCM) selecting a single-order high harmonic are presented. The TDCM was used for time-resolved photoelectron spectroscopy (TRPES) of gas-phase molecules, 1,3- and 1,2-butadienes. We discuss the relaxation dynamics in these molecules and present the features of TRPES using high harmonic pulses.View full abstractDownload PDF (1682K) -
Kozo OKAZAKI, Shik SHIN2015 Volume 43 Issue 12 Pages 838-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSWe developed a time-resolved photoemission apparatus and applied the high harmonics of a femtosecond laser to a probe light. Higher harmonics using noble gas have various merits compared to lower harmonics, including using non-linear optical crystals, so a whole Brillouin zone can be reached for angle-resolved measurements; not only the valence bands but also the shallow core levels can be measured. We show the details of our time-resolved photoemission apparatus using a high harmonic laser and introduce several examples of the applications of this experimental technique.View full abstractDownload PDF (1020K) -
Katsuya OGURI, Takanobu TSUNOI, Keiko KATO, Hidetoshi NAKANO, Tada ...2015 Volume 43 Issue 12 Pages 844-
Published: 2015
Released on J-STAGE: December 17, 2020
JOURNAL OPEN ACCESSTime-resolved photoelectron spectroscopy based on high-order harmonic source is a promising technique for directly measuring ultrafast electron dynamics in various solid state materials. In this article, we review the recent technological progress of this technique, and introduce our study of ultrafast photogenerated carrier dynamics on a semi-insulating GaAs surface using femtosecond time-resolved corelevel surface photoelectron spectroscopy. We observed a transient change in surface potential where the Ga 3d-core level photoelectron peak instantaneously shifted by about 350 meV towards a higher binding energy within 2 ps of a 100-fs laser irradiation. A comparison of the experimental result with numerical simulations based on a drift-diffusion model of a semi-insulating semiconductor revealed that the transient surface potential change is mainly due to the dynamical photo-Dember effect, in which the large difference in the carrier diffusion between electron and hole instantaneously induces surface photovoltage.View full abstractDownload PDF (2350K)
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