A Method for Distinguishing Attosecond Single Pulse from Attosecond Pulse Train

The driving laser field assisted attosecond soft-extreme-ultraviolet (XUV) photo-ionization was used successfully to measure the duration of the attosecond pulse based on the cross-correlation method. However, this method in principle cannot distinguish a single attosecond pulse from the attosecond pulse train. We propose a technique for directly distinguishing attosecond single pulse from attosecond pulse train based on the photo-ionization of atoms by attosecond XUV pulse in the presence of a two-colour strong laser pulse.     

Absence of Charge-Resonance-Enhanced Ionization in Attosecond Pulse Photoionization： Numerical Result on One-Dimensional H2^＋

We present a numerical result of photoionization rate for the one-dimensional molecular hydrogen ion model exposed to intense light of 1 × 10^16-2×10^16 W/cm^2, 55-as pulse duration, and 800nm wavelength. In contrast to the previous calculation result of charge-resonance-enhanced ionization for lower intensity and much longer pulse, our result exhibits an ionization saturation. The numerical results are interpreted in the field-dressed potential picture as over-the-barrier liberation of electrons. This extremely short pulsewidth and relatively high field phenomenon requests experimental demonstration.     

Comment on “A New Method for Determining Dipole Moment Orientation of Single Molecules”

In a recent issue of Chinese Physics Letters, Wang et al. proposed a method for determining orientation of transit‘ion dipole moments of single molecules. The suggested method is based on differences in electric field profile in fluorescence microscope produced by excitation light in epi-fluorescence illumination and total internal reflection illumination configurations,     

Reply to “Comment on ‘A New Method for Determining Dipole Moment Orientation of Single Molecules＇”

Vacha et al. made a comment on our paper,in which our paper is compared with another paper oftheirs.