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Multiple ionization and dissociation of ethylene induced by collision of Xe9+
This content has been downloaded from IOPscience. Please scroll down to see the full text. 2017 J. Phys.: Conf. Ser. 875 102017 (http://iopscience.iop.org/1742-6596/875/11/102017) View the table of contents for this issue, or go to the journal homepage for more Download details: IP Address: 185.158.100.230 This content was downloaded on 25/08/2017 at 13:50 Please note that terms and conditions apply.
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ICPEAC2017 IOP Conf. Series: Journal of Physics: Conf. Series 1234567890 875 (2017) 102017
IOP Publishing doi:10.1088/1742-6596/875/11/102017
Multiple ionization and dissociation of ethylene induced by collision of Xe 9+ K. Yokokawa*, J. Matsumoto*, H. Shiromaru* 1, P. Bhatt† , H. Kumar‡ , C. P. Safvan†2 * Department †
of Chemistry, Tokyo Metropolitan University, 1-1 Minami-Osawa, Hachioji 192-0397, Japan Inter-University Accelerator Centre, Aruna Asaf Ali Marg, New Delhi 110067, India ‡Department of Physics and Astrophysics, University of Delhi, Delhi 110007, India
Synopsis Multiple ionization and subsequent ion-ion dissociation of ethylene was studied by using intermediate energy of Xe9+. Delayed dissociation of C2H42+ ® C2H3+ + H+ is discussed.
Collision-induced multiple ionization of organic molecules sometimes leads to characteristic reactions such as hydrogen migration and efficient formation of H3+ [1,2]. As for ethylene, which is the smallest planar hydrocarbon, multiple ionization by collision of Ar8+ at low-energy region, where electroncapture is dominant, was studied focusing attention onto the fragmentation scheme [3]. In the present study, collisional multiple ionization of ethylene was studied at considerably higher energy region, where electron emission from the target also works. Experiments were conducted at the beamline in the Low Energy Ion Beam Facility of the Inter-University Accelerator Centre, using 2.25 MeV Xe 9+ beam [4]. A schematic drawing of the setup is shown in Fig. 1. The target ethylene was introduced as an effusive beam, and the emitted electrons triggered the multi-hit position sensitive TOF measurement of the recoil ions.
Figure 1. Schematic view of the apparatus. The details are given in [4].
A double-hit time-of-flight coincidence map, around the area for the heavy fragment ions, m/q = 24 – 28, with the light ones, m/q = 1 – 3, is shown in Fig. 2, in which the channels are represented as [C 2H 3+ ,H+ ] for example. The [C 2H+ ,H 3+ ] island is very weak but clearly above the background level. The diagonal line starting from the island [C 2H 3+ ,H+ ] indicates delayed dissociation takes place. While the 1
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decay profile slightly deviates from a single exponential function, the lifetime of the metastable C 2H4 2+ is estimated to be an order of 100 ns. For other channels, delayed reactions were not observed. By further analysis of the velocity vectors of the fragment ion pairs, the kinetic energy release distribution and angular distribution with respect to the projectile beam direction will be discussed. This work was partly supported by TMU travel fund for students (KY).
Figure 2. TOF coincidence map for [C2H4-n+ (n=1~4), H+] , [C2 H4-n+(n=2~4), H2+ ], and [C2 H+, H3 +] channels. The color indicates the intensity in the log scale. The diagonal line is due to the delayed dissociation.
References [1] S. De et al. 2006 Phys. Rev.Lett. 97 213201 [2] K. Hayakawa et al. 2011 J. Phys. B: At. Mol. Opt. Phys. 44 075207 [3] G. Veshapidze et al. 2004 J. Phys. B: At. Mol. Phys. 37 2969 [4] A. Kumar et al. 2014 Int. J. Mass Spectrom. 374 44
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