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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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