Atmosphere

Mao, Xianglei, Wing-Tat Chan, Mark A Shannon, and Richard E Russo. "Plasma Shielding During Picosecond Laser Sampling of Solid Materials by Ablation in He Versus Ar Atmosphere." Journal of Applied Physics 74.8 (1993) 4915–4922.

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Mao, Samuel S, Xianglei Mao, Ralph Greif, and Richard E Russo. "Initiation of an early-stage plasma during picosecond laser ablation of solids." Applied Physics Letters 77.16 (2000) 2464–2466.

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Leung, Amy P. K, Wing-Tat Chan, Xianglei Mao, and Richard E Russo. "Influence of gas environment on picosecond laser ablation sampling efficiency and ICP conditions." Analytical Chemistry 70 (1998) 4709–4716.

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