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Title:DISSOCIATION BREAKUP OF DOUBLY IONIZED N2O INDUCED BY 38.5 EV PHOTONS
Author(s):Ma, Xinwen
Contributor(s):Zhang, Shaofeng ; Dong, Dapu ; Lei, Jianting ; Zhao, Dongmei ; Najjari, Bennaceur ; Hai, Bang ; Zhang, Min
Subject(s):Small molecules
Abstract:The dissociation mechanism of N$_{2}$O$^{2+}$ has been investigated experimentally after double ionization by a single EUV photon with an energy of 38.5 eV using reaction microscope. From the ion-ion time-of-flight coincidence spectrum, the de-nitrogenation (N$_{2}$O$^{2+}$ $\rightarrow$ N$^{+}$ + NO$^{+}$) and de-oxygenation (N$_{2}$O$^{2+}$ $\rightarrow$ O$^{+}$ + N$_{2}^{+}$) channel of N$_{2}$O$^{2+}$ are identified. It is found that, after removal of two electrons, the N$_{2}$O$^{2+}$ dications are mainly promoted to the 1$^{1}\Delta$ and 1$^{1}\Sigma^{+}$ states for de-nitrogenation channel. In its KER spectra, a main peak centered at 6.4 eV with a shoulder towards higher energies is observed. The major peak is derived from the direct dissociation of N$_{2}$O$^{2+}$ from the 1$^{1}\Delta$ and 1$^{1}\Sigma^{+}$ potential curve to the N$^{+}$($^{1}$D) + NO$^{+}$($^{1}\Sigma^{+}$) (second dissociation limit L2). The shoulder is originated from the dissociation of N$_{2}$O$^{2+}$ from the 1$^{1}\Delta$ and 1$^{1}\Sigma^{+}$ states to the N$^{+}$($^{3}$P) + NO$^{+}$($^{1}\Sigma^{+}$) (first dissociation limit L1) via the crossing of 1$^{3}\Pi$ state in the potential energy curves. In addition, the relative contributions from each dissociating processes are obtained for de-nitrogenation channel. Our work shows that the table-top monochromatic EUV beam line provides great advantages in detailed studies of the electronic states and dissociation dynamics.
Issue Date:24-Jun-20
Publisher:International Symposium on Molecular Spectroscopy
Citation Info:APS
Genre:CONFERENCE PAPER/PRESENTATION
Type:Text
Language:English
URI:http://hdl.handle.net/2142/107647
Date Available in IDEALS:2020-06-26


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