The double photoionization of HCl: An ion–electron coincidence study

Abstract

The double photoionization of HCl molecules by synchrotron radiation has been studied in the energy range between 30 and 50 eV. The HCl(2+) and Cl(2+) product ions have been detected by a photoelectron-photoion-coincidence technique, while the H(+)+Cl(+) formation, which follows the double ionization of HCl, has been studied by photoelectron-photoion-photoion coincidence. The photon energy threshold for the production of HCl(2+) ions has been found to be 35.4+/-0.6 eV, while for the dissociative channel leading to H(+)+Cl(+), it has been measured a threshold at 36.4+/-0.6 eV and a change in the slope of the cross-section energy dependence at 38.7+/-0.7 eV. The production of H+Cl(2+) occurs with a threshold photon energy of 42.8+/-1.1 eV. These results appear to be in a good agreement with previous data by different experimental techniques and recent theoretical calculations performed by our laboratory.

Symmetry-adapted-cluster configuration interaction study of the doublet states of HCl+: Potential energy curves, dipole moments, and transition dipole moments

“…During the last decade intensive studies of HCl molecule and HCl + ion were accomplished both experimentally [1][2][3][4][5][6][7][8][9][10][11][12] and theoretically. [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28] The latter involves electronic structure calculations, [13][14][15][16][17] spectroscopic applications, [18][19][20][21][22] and laserdriving time-dependent processes, described by coupled Schrödinger equations [23][24][25][26][27] as well as by semiclassical approach with hopping algorithm.…”

Molecular Dications in Planetary Atmospheric Escape

“…In order to record photoions in coincidence with photoelectrons, we used the electron-ion-ion coincidence technique. The coincidence electron-ion-ion extraction and detection system was built following the model described in detail in [18] and its scheme can be seen in Figure 1. This device consists of a time-of-flight (TOF) spectrometer equipped with an ion position sensitive detector (stack of three micro-channel-plates with a multi-anode array arranged in 32 rows and 32 columns).…”

“…The reader can refer to some interesting recent review papers by Alagia et al [6] and by Sabzyan et al [13] in order to have an overview of the main characteristics and the importance of such doubly charged species. These ionic species can be produced by different techniques, such as mass spectrometry [14], ion-molecule reactions [15], and double photoionization processes [16][17][18][19]. In such a field, the importance of a number of experimental and theoretical works conducted by Eland and coworkers [20][21][22] and by Hochlaf et al [23,24] concerning the molecules of interest in the present paper must be noted.…”

Molecular Fragmentation of Acetylene by VUV Double Photoionization

“…In the latter case the so called molecular dications are produced. Molecular dications can be formed by different techniques, as mass spectrometry [8], ion-molecule reactions [9], and double photoionization processes [10][11][12][13]. They are stable or metastable [8,14] molecular species, and in the latter case they could be used, in principle, as energy storage at a molecular level [8,9,15].…”