Photon/fragment‐ion coincidence investigation of the continuous ultraviolet emissions produced by fast ion impact on CF4 and CHF3
Photon/fragment‐ion coincidence investigation of the continuous ultraviolet emissions produced by fast ion impact on CF4 and CHF3
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快离子撞击 CF4 和 CHF3 产生的连续紫外线发射的光子/碎片离子符合研究
DOI：
10.1063/1.467173
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发表时间：
1994
影响因子：
4.4
通讯作者：
R. Brenn
中科院分区：
文献类型：
--
作者：
U. Müller;M. Lange;W. Haas;R. Brenn
已知在200-500 nm波长范围内的连续或准连续带在电子、快离子和真空紫外光子撞击CF 4和CHF 3之后发射。我们在2 MeV H+、He+和He++撞击CF 4和CHF 3后进行了光子/碎片离子符合实验，目的是澄清发射体的性质并研究发射过程的动力学。在CF 4分子的情况下，我们观察到在200-500 nm范围内的光子与CF+3碎片定量一致。从符合峰的结构出发，我们导出了解离过程中释放的动能，并与光谱和总可用能量进行了比较。因此，CF+3离子是振动和/或旋转高度激发的。连续发射的原因是CF+4（C2 T2）态辐射衰变到CF+4（X2 A1）排斥势面，并迅速分解成CF+3和一个氟原子.在C…
A continuous or quasicontinuous band in the 200–500 nm wavelength range is known to be emitted following electron, fast ion, and vacuum ultraviolet photon impact on CF4 and CHF3. We performed a photon/fragment‐ion coincidence experiment following 2 MeV H+, He+, and He++ impact on CF4 and CHF3 with the objective to clarify the nature of the emitter and to study the dynamics of the emission process. In the case of the CF4 molecule, we observed that the photons in the 200–500 nm range are quantitatively coincident with CF+3 fragments. From the structure of the coincidence peak, we derived the kinetic energy released during the dissociation process and compared it with the optical spectrum and the total available energy. It follows that the CF+3 ions are vibrationally and/or rotationally highly excited. The continuous emission is explained by a radiative decay of the CF+4(C 2T2) state to the CF+4(X 2A1) repulsive potential surface which dissociates quickly into CF+3 and a fluorine atom. In the case of the C...