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Influence of gas environment on picosecond laser ablation sampling efficiency and ICP conditions

Publication Type

Journal Article

Authors

Leung, Amy P. K, Wing-Tat Chan, Xianglei Mao, Richard E Russo

Abstract

The effects of gas atmosphere on inductively coupled plasma excitation characteristics and picosecond laser ablation sampling are studied for enhancing atomic emission spectroscopy sensitivity. Five noble gases (He, Ne, Ar, Kr, Xe) were used in the laser ablation sampling chamber. The noble gases significantly influence the ICP excitation characteristics and the laser ablation sampling efficiency. There is an enhancement in ICP emission intensity for laser sampling in He and Ne and a decrease for Kr and Xe relative to Ar. Plasma shielding is a possible mechanism to explain the gas effects, as the behavior of laser sampling correlates with the ionization potential of the gas, The significant improvement in AES using He as the sample chamber gas is beneficial to chemical analysis, especially for trace analysis, which requires high sensitivity

Journal

Analytical Chemistry

Volume

Year of Publication

1998

Notes

LBNL-42474 NOT IN FILE

Organization

Laser Technologies Group, Energy Storage and Distributed Resources Division