Phosphorescence of vitreous 2-bromobenzophenone

• Published in: Физика низких температур
• Date: 2008
• Main Authors: Buravtseva, L.M., Pyshkin, O.S., Strzhemechny, M.A., Avdeenko, A.A.
• Format: Article
• Language: English
• Published: Фізико-технічний інститут низьких температур ім. Б.І. Вєркіна НАН України 2008
• Subjects: Низкоразмерные и неупорядоченные системы
• Online Access: https://nasplib.isofts.kiev.ua/handle/123456789/116978
• Journal Title: Digital Library of Periodicals of National Academy of Sciences of Ukraine
• Cite this: Phosphorescence of vitreous 2-bromobenzophenone / L.M. Buravtseva, O.S. Pyshkin, M.A. Strzhemechny, A.A. Avdeenko // Физика низких температур. — 2008. — Т. 34, № 6. — С. 587–591. — Бібліогр.: 16 назв. — англ.

Spectroscopic studies of vitreous 2-bromobenzophenone have been carried out over the respective domain
 of its stability. Glassy 2-bromobenzophenone samples were obtained by abrupt cooling of the melt by
 cold helium vapor. Quantum yield measurements allowed us to establish that the upper boundary of stable
 glass is slightly above 100 K while at about 220 K the glass melts. Phosphorescence measurements at 4.2 K
 showed that even at this low temperature the emission contains a strong excimer component. The energy position
 and shape (two bands) of the excimer emission are close to those observed in the crystal of
 2-bromobenzophenone at higher temperatures. Contrary to findings in the crystal, the monomeric emission
 of the glass contains only one C=O stretch series, every band of which is substantially broader than in the
 crystal. As the temperature is raised, the monomeric emission intensity goes down to completely disappear
 above 70 K.