Mobility and dissociation of electronically excited ${\mathrm{Kr}}_{2}^{+}$ ions in cold krypton plasma

Steen, Cyril Van de; Benhenni, Malika; Kalus, René; Ćosić, Rajko; Gadéa, Florent Xavier; Yousfi, Mohammed

doi:10.1088/1361-6595/ab3a17

Cited by 3 publications

(18 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The calculated rate constants have then been used, together with rate constants of radiative transitions calculated here using a semiclassical approach (see Sec. II B 2) and rate constants of collision-induced dimer ion disappearance reported in preceding studies [19,20], in kinetic modelings of electronic relaxation in Kr + . It should be noted that the considered reaction rate constants may in general depend on the initial rotational-vibrational excitation of the ionic dimer.…”

Section: Figures and Tablesmentioning

confidence: 84%

“…However, as discussed in detail in Ref. [20], the dimer-to-monomer charge transfer, Kr + 2 + Kr → Kr + + Kr 2 , leading to the same ionic fragment as the dimer dissociation, may also play a role if specific electronic states of the dimer ion are populated prior to collision.…”

Section: Discussionmentioning

confidence: 99%

“…Outputs of preceding dynamical calculations on Kr + 2 /Kr collisions occurring in cold krypton plasma [19,20] have been re-analyzed to get effective cross-sections and rate constants of collision-induced inter-state transitions in Kr + 2 ions. In addition, rate constants of interstate transitions resulting from spontaneous radiative processes occurring in electronically excited Kr + 2 ions have also been calculated using a semiclassical approach based on the classical treatment of nuclei and a full quantum description of electrons.…”

Section: Discussionmentioning

confidence: 99%

“…[25] In general (see, e.g., Ref. 19), distances in the dimer are sampled from (squares of) nuclear wave functions obtained for a given rotational-vibrational state (ground state in this work) by numerically solving two-particle Schrödinger equation for the two krypton nuclei. Afterwards, nuclear velocities are added in the perpendicular direction to the dimer bond axis to get required rotational angular momentum (does not apply in this work) and along the bond axis to get the required rotational-vibrational energy (zero-point vibration energy in this work).…”

Section: Discussionmentioning

confidence: 99%

“…As mentioned above, the collision-induced dimer ion disappearance (cDID) rate constants were reported for the Kr + 2 ion in two immediately preceding studies [19,20] and the reader is referred therein for necessary details. For completeness, they are also summarized in a form appropriate for the present analysis [29] in Fig.…”

Section: Dimer Ion Disappearance Rate Constantsmentioning

confidence: 99%

See 4 more Smart Citations

Relaxation of electronic excitations in Kr2+ ions in cold krypton plasma.

Steen¹,

Benhenni²,

Kalus³

et al. 2019

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

Reaction rate constants have been calculated for electronic transitions in Kr + 2 ions and for their decay as induced by collisions with krypton atoms and/or spontaneous radiation processes. The rate constants have then been used in a series of modelings of electronic relaxation in the ions in cold krypton plasmas with the main focus on relaxation times and final states. It has been shown that the collision-induced (non-radiative) relaxation is much faster than the radiative one and completely dominates with typical relaxation times ranging between nanoseconds and microseconds. The relaxation always ends up in the Kr + 2 electronic ground state, high electronic excitations survive for longer times than lower excitations due to spin-orbit coupling effects.

show abstract

Section: Figures and Tablesmentioning

confidence: 84%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Dimer Ion Disappearance Rate Constantsmentioning

confidence: 99%

See 3 more Smart Citations

Relaxation of electronic excitations in Kr2+ ions in cold krypton plasma.

Steen¹,

Benhenni²,

Kalus³

et al. 2019

Plasma Sources Sci. Technol.

Self Cite

View full text Add to dashboard Cite

show abstract

Radiation-induced phenomena in thermally treated Kr matrices

Savchenko

Khyzhniy

Uyutnov

et al. 2023

Low Temperature Physics

View full text Add to dashboard Cite

The effect of thermal treatment on relaxation phenomena in Kr matrices irradiated with a low-energy electron beam has been studied. The experiments were carried out using measurements of the relaxation emissions of preirradiated Kr samples, which were unannealed and annealed before exposure to an electron beam. Three types of emissions were monitored in a correlated real-time manner: thermally stimulated luminescence, thermally stimulated exoelectron emission, and total yield of particles via pressure measurements. The energy levels of defects were estimated from the thermally stimulated luminescence data of the annealed sample. Two types of electron-hole traps created by electronic excitation were identified: close pairs and distant ones. Additional confirmation of the “excited state” mechanism of defect formation was obtained. Analysis of the correlation of yields and the effect of thermal treatment gave additional arguments in support of the crowdion model of anomalous low-temperature post-desorption from pre-irradiated Kr matrices.

show abstract

Plasma behavior of a low current orificed hollow cathode using krypton propellant for electric thruster applications

Liu

Wang

et al. 2023

J. Phys. D: Appl. Phys.

View full text Add to dashboard Cite

As a fundamental component, hollow cathode has been widely used in electric thruster applications. Krypton has be-come one of the ideal alternative propellant for hollow cathode due to its economy thus it is vital to understand the basic physical process of the discharge of Krypton-fed hollow cathode. This study set out to establish a two-dimensional fluid model coupled with the equations for gas flow and heat transfer allowing to obtain the self-consistent description of the cathode discharge. The anomalous collision term based on the formulations of Sagdeev and Galeev is considered in this model. The model is validated by comparing the simulated and measured plasma characteristic parameters and reasonable agreement is reached. The findings show that the discharge of the Krypton-fed hollow cathode is character-ized by the lower plasma density, higher electron temperature, and higher spatial electric potential compared with that of Xenon-fed hollow cathode and tends to present a higher plasma density in the cathode plume region when it is operat-ing with the diode configuration. The double layer formed at the keeper orifice is an important factor for the low elec-tron temperature distribution which is greatly affected by the keeper current. These findings add to our understanding of plasma behavior in the discharge of a low current Krypton-fed hollow cathode and support further development of cred-ible Krypton-fed hollow cathode.

show abstract

Mobility and dissociation of electronically excited ${\mathrm{Kr}}_{2}^{+}$ ions in cold krypton plasma

Cited by 3 publications

References 32 publications

Relaxation of electronic excitations in Kr<sub>2</sub><sup>+</sup> ions in cold krypton plasma.

Relaxation of electronic excitations in Kr<sub>2</sub><sup>+</sup> ions in cold krypton plasma.

Radiation-induced phenomena in thermally treated Kr matrices

Plasma behavior of a low current orificed hollow cathode using krypton propellant for electric thruster applications

Contact Info

Product

Resources

About