Generation of Multiply Charged Argon Ions in Nanosecond Laser Field Ionization of Argon Clusters

The Journal of Physical Chemistry Letters
Rajesh K Vatsa, Deepak Mathur

Abstract

Zhang and co-workers ( J. Phys. Chem. Lett. 2020, 11, 1100-1105) have recently reported results of experiments involving irradiation of argon clusters doped with bromofluorene chromophores by nanosecond-long pulses of 532 nm laser light. Multiply charged ions of atomic argon (Arn+, 1 ≤ n ≤ 7) and carbon (Cn+, 1 ≤ n ≤ 4) are observed, which are sought to be rationalized using an evaporation model. The distinguishing facet of exploding clusters being progenitors of energetic ions and electrons constitutes the key driver for contemporary research in laser-cluster interactions; it is, therefore, important to point out inconsistencies that are intrinsic to the model of Zhang and co-workers. In light of similar reports already in the literature, we show that their model is of limited utility in describing the dynamics that govern how fast, multiply charged atomic ions result from laser irradiation of gas-phase clusters. We posit that it is plasma behavior that underpins cluster heating and cluster explosion dynamics.

References

Aug 11, 2001·Physical Review Letters·V KumarappanD Mathur
May 10, 2005·Rapid Communications in Mass Spectrometry : RCM·P SharmaS K Kulshreshtha
Feb 6, 2016·Physical Review Letters·Bernd SchütteThomas Fennel
Jan 25, 2020·The Journal of Physical Chemistry Letters·Jie ZhangWei Kong

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