Dynamics of atomic clusters in intense optical fields of ultrashort duration

Journal of Chemical Sciences

Firoz A Rajgara¹  Deepak Mathur1¹ 

[1] Tata Institute of Fundamental Research, 1 Homi Bhabha Road, Mumbai 400 005, India$$

关键词: Atomic clusters;    Coulomb explosion;    few-cycle laser pulses;    strong fields;    cluster dynamics.;   

DOI  :  

来源: Indian Academy of Sciences

【 摘 要 】

Intense laser pulses have been generated that last for only 10 fs, long enough to accommodate only 3 optical cycles of 800 nm light. Upon focussing such pulses, intensities in the 1015 W cm−2 range are readily generated. At such intensities, the magnitude of the optical field begins to match intra-atomic Coulombic fields. Consequently, exposure of atoms and molecules to such intense pulses inevitably leads to single and multiple ionization. We report here results of experiments that we have conducted that involve irradiation of gas-phase Ar15,000 clusters by such intense, few-cycle laser pulses. The clusters become multiply ionized and undergo Coulomb explosion, giving rise to ejection of fast Ar-ions. Results show that the strong-field dynamics in the few-cycle domain differ significantly from those that occur in the longer pulse (> 30 fs) regime. Manifestations of these differences are presented in the form of angle-dependent ion energy and ion yield functions.

【 授权许可】

Unknown