DISSOCIATION BREAKUP OF DOUBLY IONIZED N2O INDUCED BY 38.5 EV PHOTONS

Ma, Xinwen

Permalink

https://hdl.handle.net/2142/107647 Copy

Description

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

Issue Date

24-Jun-20

Keyword(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.

Publisher

International Symposium on Molecular Spectroscopy

Type of Resource

Text

Language

English

Permalink

http://hdl.handle.net/2142/107647

Owning Collections