Two-Photon Spectroscopy of Core Excitons in Barium Fluoride Using Synchrotron Radiation and Laser Light

Luminescence spectroscopy with synchrotron radiation: History, highlights, future

“…The first luminescence experiment with VUV-FEL excitation was performed by Kirm et al [49] during the test phase. 5 Like Tsujibayashi et al [42], they were able to observe CL of BaF 2 although the photon energy of excitation (13.9 eV) was well below threshold. This demonstrates that twophoton processes have been observed.…”

“…The tiny spot of exciting radiation at the sample would also make feasible experiments in high-pressure cells or in combination with high magnetic fields. The experiment by Tsujibayashi et al [42] clearly demonstrated that the combination of an undulator source and a laser in the visible or UV range opens new and exciting fields (successful combination of SR with a laser for two-photon absorption has been demonstrated already long ago at the ADONE storage ring at Frascati [48], however, it seems as if the true break-through in this field is the use of undulator sources).…”

“…Tsujibayashi et al [42] succeeded in combining the SR VUV light from an undulator (UVSOR) with a Ti:sapphire laser for two-photon excitation in the far VUV. The key for discrimination between one-photon and true two-photon events was spectral selection of CL, tuning the VUV source below the threshold of cross luminescence so that only the addition of the laser photon created the necessary hole in the cation-VB.…”

Photostimulated detection of radiation defects produced by VUV light in BaF2

“…Recently we have constructed a combined system of synchrotron radiation (SR) and laser for research of solid-state physics and have applied it to two-photon spectroscopy of alkaline earth fluorides (Arimoto et al, 1998;Asaka et al, 1998;Azuma et al, 2001;Tsujibayashi et al, 1999Tsujibayashi et al, , 2005. In the present work, we have applied the system to the study of radiation damage in BaF 2 under irradiation by vacuum ultraviolet (VUV) light.…”

Core exciton migration in Rb0.82Cs0.18Cl under excitation with synchrotron radiation and laser light

“…We have constructed a measuring system that enables the simultaneous excitation of a sample with SR and laser light at UVSOR, Institute for Molecular Science, Okazaki, and experimental setup is described elsewhere [3][4][5]. The average power, photon energy, and the pulsewidth of the laser were 190 mW, 1.55 eV, and 0.3 ns, respectively.…”