Search

Abstract: In-trap photoinduced electron detachment was performed on negatively charged proteins with molecular weights ranging from 8.6 to 77kDa. The advantages of photodetachment over photodissociation are discussed in the context of action spectroscopy of very large ions. The resulting gas phase photodetachment yield spectra recorded in the UV range (220–310nm) are presented and are compared with solution absorption spectra. The important question of the influence of the conformation and charge state of a protein on its optical gas phase spectrum is raised. [ABSTRACT FROM AUTHOR]

The resonance effects on the optical second-harmonic generation from 140-nm silver nanoparticles is studied experimentally by hyper-Rayleigh scattering and numerically by finite element method calculations. We find that the interferences between the broad dipolar and narrow octupolar surface plasmon resonances leads to nonlinear Fano profiles that can be externally controlled by the incident polarization angle. These profiles are responsible for the plasmon-induced suppression of the second harmonic generation. [ABSTRACT FROM AUTHOR]