Observation of Resonances in Penning Ionization Reactions at Sub-Kelvin Temperatures in Merged Beams

被引：265

作者：

Henson, A. B. ^{[1
]}

Gersten, S. ^{[1
]}

Shagam, Y. ^{[1
]}

Narevicius, J. ^{[1
]}

Narevicius, E. ^{[1
]}

机构：

[1] Weizmann Inst Sci, Dept Chem Phys, IL-76100 Rehovot, Israel

来源：

SCIENCE | 2012年 / 338卷 / 6104期

基金：

以色列科学基金会;

关键词：

ORBITING RESONANCES; MOLECULAR-BEAM; CROSS-SECTIONS; SCATTERING; ATOMS; POTENTIALS;

D O I：

10.1126/science.1229141

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Experiments have lagged theory in exploring chemical interactions at temperatures so low that translational degrees of freedom can no longer be treated classically. The difficulty has been to realize in the laboratory low-enough collisional velocities between neutral reactants to access this regime. We report here the realization of merged neutral supersonic beams and the manifestation of clear nonclassical effects in the resulting reactions. We observed orbiting resonances in the Penning ionization reaction of argon and molecular hydrogen with metastable helium, leading to a sharp absolute ionization rate increase in the energy range corresponding to a few degrees kelvin down to 10 millikelvin. Our method should be widely applicable to many canonical chemical reactions.

引用

页码：234 / 238

页数：5

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