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Time-resolved photoelectron spectroscopy (TRPES) of gaseous polyatomic molecules using 266-nm (4.7eV) pump and 42-nm (29.5eV) probe pulses is presented. A 1-kHz Ti:sapphire laser with a 35fs pulse duration is employed to generate high harmonics in Kr gas, and the 19th harmonic (42-nm) was selected using two SiC/Mg mirrors. Clear observation of the ultrafast electronic dephasing in pyrazine and photoisomerization...
Optical pump‐THz probe (OPTP) measurements allow us to investigate the dynamic response of photoconductivity in materials by observing the transient change of THz transmittance after optical excitation. In this study, the THz response of d ‐electrons in various photoexcited states in MnO was investigated by pump‐energy‐tunable OPTP measurements to elucidate the photoexcited d ‐electron dynamics in...
We performed optical-pump terahertz-probe measurements on antiferromagnetic MnO. The transient decrease in transmission at the peak of THz single-cycle pulses suggests that photoexcited carriers are produced in MnO. Below the Neel temperature, magnon scattering mainly contributes the relaxation of photoexcited carriers.
We have observed coherent terahertz emission from TTF-TCNQ films excited by femtosecond laser pulses. The waveform consists of a weak pulse and damped oscillations with a frequency of 1.4 THz. The oscillations are considered to be radiation from optically excited coherent phonons.
We have observed terahertz radiation from antiferromagnetic MnO excited by femtosecond laser pulses. The oscillations following the main pulse are radiation from optically excited antiferromagnetic magnons. The origin of the main pulse radiation can be attributed to second-order nonlinear optical effects in bulk and/or at surface with antiferromagnetic spin order.
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