Photophysical relaxation mechanism of excited phtalimide compounds

Relaxation of optically excited carriers in graphene

Vibrational relaxation of highly excited toluene

The collisional loss of vibrational energy from gas-phase toluene, pumped by a pulsed KrF laser operating at 248 nm, has been observed by monitoring the time-resolved infrared fluorescence from the C-H stretch modes near 3.3 p,m. The fragmentation quantum yield of toluene pumped at 248 nm was determined experimentally to be -6%. Energy transfer data were obtained for 20 collider gases, includin...

Excited-state relaxation in PbSe quantum dots.

In solids the phonon-assisted, nonradiative decay from high-energy electronic excited states to low-energy electronic excited states is picosecond fast. It was hoped that electron and hole relaxation could be slowed down in quantum dots, due to the unavailability of phonons energy matched to the large energy-level spacings ("phonon-bottleneck"). However, excited-state relaxation was observed to...

Collisional relaxation of highly excited vibrational levels of I2(X)

The relaxation dynamics of vibrationally excited levels of I2(X) are of relevance to the chemical oxygen iodine laser. We have investigated relaxation of 12(vM>20) by pulsed laser techniques. Individual ro-vibrational levels were populated by stimulated emission pumping. Collisionally populated levels were monitored via laser excitation of the D-X transition. Preliminary rate constants for vibr...

Self-Excited Walking of a Biped Mechanism

This paper present a self-excited walking of a fourlink biped mechanism which possesses an actuated hip joint and passive knee joints. First we manifested that this self-excitation control enables 3-DOF planar biped model to walk on a level ground, by numerical simulation. Next we showed experimental study of a manufactured planar biped walking robot. We demonstrated that stable walking can be ...