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Airborne-mercury detection by resonant UV laser pumping

机译:共振紫外激光泵浦检测空气中的汞

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Optical pumping of the Hg-0 (6s S-1(0)-->6p(3)P(1)) transition at 253.7 nm (in air) leads to extremely fast energy transfer and strong laser-induced-fluorescence (LIF) from the Hg-0 (7s S-3(1)-->6p(3)P(2)) green transition at 546.2 nm, which is not directly populated by the laser. Ionization occurs simultaneously and becomes particularly strong at reduced background pressures. These observations are consistent with the existence of a multiphoton process followed by electron collisional excitation. Preliminary studies are made to evaluate these phenomena for detecting elemental airborne mercury by LIF and point monitoring with an ionization detector. Measured sensitivities of 2 and 10 parts in 10(9) (ppb), respectively, at 0.1-Torr air pressure are projected to increase to 1 x 10(-4) and 1 x 10(-5) ppb after relevant system optimization. (C) 1997 Optical Society of America.
机译:Hg-0(6s S-1(0)-> 6p(3)P(1))跃迁在253.7 nm处(在空气中)导致极快的能量传输和强激光诱导的荧光(LIF )从Hg-0(7s S-3(1)-> 6p(3)P(2))在546.2 nm处发出绿色跃迁,该跃迁不是由激光直接填充的。电离同时发生,并且在降低的背景压力下变得特别强。这些观察结果与随后的电子碰撞激发的多光子过程的存在是一致的。进行了初步研究以评估这些现象,以通过LIF探测空气中的汞,并使用电离探测器对点进行监测。在相关系统优化后,预计在0.1Torr气压下,分别以10(9)(ppb)计的2和10份的灵敏度将增加到1 x 10(-4)和1 x 10(-5)ppb。 (C)1997年美国眼镜学会。

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