Knowledge Bank

Laser excitation and phosphorescence spectra of benzophenone (BP) under high pressure are investigated at $2\circ K$ using a diamond anvil cell. BP is doped in a $4,4\ast dibromodiphenyl$ ether (DDE) single crystal. Early high pressure spectral works of BP were performed at room - or $LN2$ - temperature (1). Our utilization of LHe. has produced highly resolved spectra, separating the intramolecular transitions with their phonon side-band. High pressure does not degrade the known BP/DDE low temperature spectra. We will report spectral investigation up to 40 kbar. Pressure dependence of the electronic $(T1)$ origin, C - O stretch and other vibrational frequencies and the DebyeWaller factor of BP/DDE will be presented. These results shed new light on our recent magnetic resonance work on BP under pressure (2). They also elucidate the modifications of electron.phonon coupling of BP/DDE under compression.