Biomedical subjects

F Ráksi

Publications and source records attributed to F Ráksi.

2 recordsLinked to original sources

PubMed2001

Femtosecond Structural Dynamics in VO2 during an Ultrafast Solid-Solid Phase Transition.

Femtosecond x-ray and visible pulses were used to probe structural and electronic dynamics during an optically driven, solid-solid phase transition in VO(2). For high interband electronic excitation (approximately 5 x 10(21) cm(-3)), a subpicosecond transformation into the high-T, rutile phase of the material is observed, simultaneous with an insulator-to-metal transition. The fast time scale observed suggests that, in this regime, the structural transition may not be thermally initiated.

Journal Article↗

PubMed1992

Bacteriorhodopsin: a picosecond optoelectric signal transducer.

This paper summarizes the results found in our laboratory investigating the ultrafast light-induced charge separation in bacteriorhodopsin. A special technique was elaborated for dried oriented samples of long term stability. An upper limit of 21 ps was found by a direct electric method for the early charge separation processes. A permanent electric field on the surface of illuminated samples was demonstrated. The potential application of such samples as ultrafast optoelectric signal transducers is discussed.

Bacteriorhodopsins↗