Proton polarization in photo-excited aromatic molecule at room temperature enhanced by intense optical source and temperature control

Sakaguchi, Satoshi; Uesaka, T.; Kawahara, Tetsuro; Ogawa, Teiichiro; Tang, T. L.; Teranishi, Takashi; Urata, Yoshiharu; Wada, Satoshi; Wakui, Takashi

doi:10.1016/j.nimb.2013.07.067

Cited by 2 publications

(2 citation statements)

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“…3 As a well-known organic scintillator, p-terphenyl and its doped compounds have been extensively investigated. 2,12,13 However, little is known about either the intrinsic nature of the molecular conformational changes or the way it is affected by the doping. The use of pentacene-doped p-terphenyl crystals as a gain medium calls for more details on their nature.…”

Section: Introductionmentioning

confidence: 99%

“…The recent discovery of the MASER based on a pentacene-doped p -terphenyl crystal can operate at room temperature without the need for intense magnetic fields, which constituted an exciting step forward toward reducing the operating requirements . As a well-known organic scintillator, p -terphenyl and its doped compounds have been extensively investigated. ,, However, little is known about either the intrinsic nature of the molecular conformational changes or the way it is affected by the doping. The use of pentacene-doped p -terphenyl crystals as a gain medium calls for more details on their nature.…”

Section: Introductionmentioning

confidence: 99%

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Growth of Pentacene-Doped p-Terphenyl Crystals by Vertical Bridgman Technique and Doping Effect on Their Characterization

Chen

Feng

et al. 2017

Crystal Growth & Design

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High quality pentacene-doped p-terphenyl crystals were successfully grown by the modified vertical Bridgman technique with a specially designed double-walled ampule. Upon the dopant addition, the growth crystal exhibits a color change from colorless to purple due to the guest-induced absorption changes. Powder X-ray diffraction, Fourier transform infrared (FTIR), 1H nuclear magnetic resonance (NMR), and fluorescence spectra studies of the doped crystal were carried out and compared with those of a pure p-terphenyl crystal. The decrease in both crystallinity and fluorescent intensity of the doped crystal clearly indicates that the guest molecules appear as defects in the form of irregularly oriented molecules which do not significantly distort the crystal structures. No significant changes on FTIR and 1H NMR spectral features of the doped crystal in relation to the corresponding features observed for the single crystal shows that the crystal doping in such small amounts does not lead to noticeable changes of the intermolecular interaction energy.

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