Numerical simulation of impurity desorption induced by nanosecond and femtosecond laser pulses

作者：Chi Yinsheng; Lin Xiaohui; Chen Minhua; Chen Yunfei^*

来源：Journal of Applied Physics, 2006, 100(3).

DOI：10.1063/1.2234552

• Excited energy carriers
• Impurity molecule desorption
• Nanosecond lasers

A model based on a stochastic process was developed to study the impurity molecule desorption from a substrate induced by nanosecond and femtosecond lasers. The dynamics of adsorbed molecules irradiated by the laser pulses can be considered to be a Brownian motion in the bath of excited energy carriers. A two-step model was used to describe the nonequilibrium heating process induced by the femtosecond laser pulses. The difference between the desorption processes induced by nanosecond and femtosecond lasers was discussed based on the numerical results for the desorption of CO molecules from a Ru surface. Results indicate that the femtosecond laser is a much better tool for desorption than the nanosecond laser.

• 出版日期2006
• 单位东南大学