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The Photodissociation dynamics of C6H11Br was investigated near 234 nm. A two-dimensional photofragment ion-velocity imaging technique coupled with a (2+1) resonance-enhanced multiphoton (REMPI) ionization scheme was utilized to obtain the angular and translational energy distributions of the nascent Br(P-2(3/2)) and Br * (P-2(1/2)) atoms. The relative quantum yields were obtained from (2+1) resonance-enhanced multiphoton ionization (REMPI) of the photofragment Br*(P-2(1/2)) and Br(P-2(3/2)). It was suggested that Br* came from the direct dissociation of S-1 state mostly, while Br atom was produced by non-adiabatic transition between the S-2 and T-3 states. Consequently, the higher internal energy distribution and the broader translational energy distribution of Br channel than those of Br * formation channel can be explained well. The results indicated that a large fraction of the available energy translated into the internal energy of the fragments, which can be explained using the soft impulsive model. However, comparing with other long-chain bromoalkane, more available energy was translated into the kinetic energy. The relationship between the energy partition and the cyclohexyl radical structure were analyzed.

The characteristics of the fiber-optical hydrophone systems based on the all optical fiber Mach-Zehnder′s interferometer were tested and analyzed,according to optical fiber hydrophone working principle.The experimental system was built and the performances of fiber-optic hydrophone were tested in different conditions.The result shows that with the increasing of sphere of fish activities and the decreasing of surrounding temperature,the detection sensitivity is linear decline and the least resolution is decreased,which are corresponded with the calculated ones.

We present a theoretical scheme for conversion from ultracold atoms to heteronuclear tetrameric molecule A3B via Efimov resonace-assisted stimulated Raman adiabatic passage (ER-STIRAP). The dark state solutions of the system are obtianed for two different pathways. For the first pathway, the intermediate state is populated by homonuclear Efimov trimer A3, and the second one by heteronuclear Efimov trimer A2B. The feasibility and the effectiveness of the scheme are also verified. Meanwhile, we investigate the effects of external field parameters, including the intensity of associated laser pulses, its width, magnetic coupling strength and its detuning, on the fomation of heteronuclear tetrameric molecules. By comparison, it is found that the ultimate yield of the tetrameric molecules for the second pathway is less than ones for the first pathway. In addition, the effects of the intrinsic nolinearity of the system and the spontaneous decay in the intermediate state on the tetramer formation are discussed.