Study of the Ne(3P2) + CH3F Electron-Transfer Reaction below 1 K
Study of the Ne(3P2) + CH3F Electron-Transfer Reaction below 1 K
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DOI：
10.1021/jp502989g
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发表时间：
2014-06-05
影响因子：
2.9
通讯作者：
Osterwalder, Andreas
中科院分区：
文献类型：
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作者：
Jankunas, Justin;Bertsche, Benjamin;Osterwalder, Andreas
对于低碰撞能量下的电子转移反应的动力学知之甚少。我们提出了一个研究基态甲基氟分子的潘宁电离电子激发氖原子在13 μ eV-4.8 meV（150 mK-56 K）的碰撞能量范围内，使用中性中性合并束装置。通过计算CH_3F ~+、CH_2F ~+和CH_3 ~+产物离子的数目，测量了Ne（P-3（2））+CH_3F反应通道的相对截面。在20 K以上的碰撞能量下，实验截面明显偏离Langevin俘获模型。分支比是恒定的。换句话说，CH 3F分子的化学形状，如通过Ne（P-3（2））原子所看到的，似乎不随碰撞能量的变化而改变，这与在较高碰撞能量下的相关Ne（P-3（J））+CH 3X（X = Cl和Br）反应相反。
Relatively little is known about the dynamics of electron-transfer reactions at low collision energy. We present a study of Penning ionization of ground-state methyl fluoride molecules by electronically excited neon atoms in the 13 mu eV-4.8 meV (150 mK-56 K) collision energy range, using a neutral neutral merged beam setup. Relative cross sections have been measured for three Ne(P-3(2)) + CH3F reaction channels by counting the number of CH3F+, CH2F+, and CH3+ product ions as a function of relative velocity between the neon and methyl fluoride molecular beams. Experimental cross sections markedly deviate from the Langevin capture model at collision energies above 20 K. The branching ratios are constant. In other words, the chemical shape of the CH3F molecule, as seen by the Ne(P-3(2)) atom, appears not to change as the collision energy is varied, in contrast to related Ne(P-3(J)) + CH3X (X = Cl and Br) reactions at higher collision energies.