Formation of inner-shell autoionizingCO+states below theCO2+threshold

Abstract

We report a kinematically complete experiment on the production of CO + autoionizing states following photoionization of carbon monoxide below its vertical double-ionization threshold. Momentum imaging spectroscopy is used to measure the energies and body-frame angular distributions of both photo-and autoionization electrons, as well as the kinetic energy release (KER) of the atomic ions. These data, in combination with ab initio theoretical calculations, provide insight into the nature of the cation states produced and their subsequent dissociation into autoionizing atomic (O * ) fragments.

Following dynamic nuclear wave packets in N2,O2, and CO with few-cycle infrared pulses

“…A number of other dissociative states may contribute as well in this region [28,44] . [30,31,[40][41][42]. Fig.…”

Dynamic modification of the fragmentation of autoionizing states of O2+

“…As the internuclear separation is increased beyond 2.27 a.u., there are numerous crossings among the excited states and the two inner-valence states rapidly lose their valence character as they take on more Rydberg character. To arrive at the plotted curves, we examined the dominant CI coefficients as a function of R, allowing states to cross if there was little interaction, but following the adiabatic curve otherwise [14]. The 4 g − and 2 g states cross the O 2+ 2 ground state near R = 66 a.u.…”

“…It is well known that the fragmentation of any oxygenbearing diatomic molecule can produce autoionizing excited states of neutral atomic oxygen fragments [11][12][13][14]. Since the autoionization usually occurs on a time scale longer than that for fragmentation, the population of cation states of the molecule which dissociate to a charged ion plus autoionizing atomic oxygen atoms ultimately results in the observation of ion pairs in the dication channel.…”

Ionic fragmentation of the CO molecule by impact of 10-keV electrons: Kinetic-energy-release distributions

“…The fragmentation dynamics of a multiply charged molecule induced by charged particles and photons is a very active area of research in recent times [1][2][3][4][5][6]. It has wide applications in the field of science and technology because it helps to explore the details of collision induced processes in the field of astrophysics, atmospheric physics, plasma physics, and radiation damage of biological systems [7][8][9].…”

“…The partial ionization cross sections (PICSs) ( [14][15][16][17] and references therein) and the fragmentation dynamics of the CO molecule have been studied by many workers in the past [18][19][20][21][22][23][24][25][26][27]. Most of the studies were devoted to the electronic states of singly charged molecular ion and/or of the fragmentation channel C + + O + arising either from the dissociation of a CO 2+ ion or from the autoionization of a highly excited CO + ion with the impact of low-energy electrons and photons [3,4,[18][19][20]. Few studies have been devoted to examining the multiply charged molecular ions of CO using different experimental techniques by the impact of ions and the intense laser fields [5,[21][22][23][24][25][26].…”