Excitation of transitions terminating at the 4f 12(3 H)5d6s 2(6,3/2) levels of the thulium atom

The excitation of transitions terminating at the 4f ¹²(³ H)5d6s ²(6,3/2) levels of the thulium atom are studied experimentally. Seventy-five cross sections of the TmI spectral lines are measured at an excitation electron energy of 50 eV. Five optical excitation functions are recorded in the electron energy range of 0–200 eV.     

Excitation of a singly charged Sr Ion by e-Sr collisions

Excitation of spectral lines of SrII, including laser lines, is studied experimentally in collisions of slow electrons with strontium atoms. Twenty-one excitation cross sections are measured at an energy of electrons of 30 eV. Five optical excitation functions are recorded at an energy ranging from 0 to 200 eV. Direct-excitation cross sections for the 5p ² P°_{1/2, 3/2} levels and the contribution to their population by cascade transitions are calculated. Excitation cross sections of two laser transitions in the IR spectral region are determined using known branching ratios. The results obtained are compared with data of previous experiments.     

Electron-impact excitation of the 3 P o and 3 D o levels of a nickel atom

The excitation cross sections of transitions from the ³ P ^o and ³ D ^o levels of a nickel atom in electron-atom collisions at an exciting-electron energy of 50 eV have been analyzed by the method of extended crossing beams with detection of the optical signal from excited atoms. Eleven optical excitation functions have been recorded in the electron-energy range of 0?C200 eV. The direct excitation cross sections of the energy levels and the contribution of the cascade transitions were calculated using the data obtained.     

Dissociative Excitation of the Odd Sextet Levels of the Cobalt Atom by Collisions of Electrons with Cobalt Dichloride Molecules

Inelastic collisions of slow electrons with cobalt dichloride molecules, leading to the formation of excited cobalt atoms in odd sextet states, are experimentally studied. At an incident electron energy of 100 eV, thirty six dissociative excitation cross sections are measured for levels belonging to the z⁶D°, z⁶F°, and z⁶G° terms. In the electron energy range of 0–100 eV, ten optical excitation functions are recorded. The full cross sections for the dissociative excitation of the cobalt atom levels and the contribution of cascade transitions to their population are determined. The cross sections for electron–molecule and electron–atom collisions are compared.     

Radiative transitions in the system of autoionizing levels of cesium atoms excited by electron impact

We study the energy dependences of electron excitation cross sections of the autoionizing levels (5p ⁵6s ²)² P _3/2 and (5p ⁵5d(³ P)6s)² P _3/2, as well as the autoionization cross sections of cesium atoms in the impact energy range from the excitation threshold to 600 eV. It is established that an increase in the excitation cross section of the ² P _3/2 levels (to 60% of the maximum value) and the deep minimum in the autoionization cross section observed in the energy region of 17–27 eV are caused by the predominance of the radiative decay channel for autoionizing levels with excitation thresholds above 17 eV. The high efficiency of the process is mainly related to the resonance excitation of these levels in the near-threshold energy region.     

Formation of singly charged selenium ions in e-Se2 collisions

The excitation of spectral lines of Se II in e-Se₂ collisions has been studied for the first time. Forty-eight excitation cross sections of Se II spectral lines have been measured at an electron energy of 50 eV. Three optical excitation functions have been recorded in an electron energy range of 0–100 eV. Possible reaction channels at low electron energies are discussed.     

Excitation of low-lying even levels of the holmium atom in the electron-atom collisions

In an experimental study of excitation of the holmium atom by electrons with an energy of 50 eV, the excitation cross sections are measured for 102 transitions from even levels of Ho I. Radiative transitions to the 4f ¹¹6s ^{2 4} I°_{13/2,11/2,9/2} levels of the ground state term are considered. Twenty-nine optical excitation functions are recorded in the exciting electron energy range of 0–250 eV. An classification of a number of Ho I lines located in the UV and visible spectral regions is proposed using the known energy levels.     

Inelastic collisions of slow electrons with SrBr<Subscript>2</Subscript> molecules

Inelastic collisions of slow electrons with SrBr₂ molecules were studied experimentally. The dissociative excitation cross sections of two lines of the strontium atom and eight lines of the singly charged strontium ion were measured. Six optical excitation functions were recorded over the electron energy range 0–100 eV. Dissociative excitation cross sections were also measured for two strontium monobromide sequences related to the B ²Σ⁺-X ²Σ⁺ system.     

The dissociative excitation of cobalt atom even sextet levels in collisions of electrons with CoCl2 molecules

The cross sections of dissociative excitation of 46 transitions from cobalt atom even sextet levels in collisions of electrons with CoCl₂ molecules were measured at an exciting electron energy of 100 eV. The dissociative and direct CoI excitation cross sections were compared. The results were used to calculate the total cross sections of dissociative excitation of CoI levels at an electron energy of 100 eV. Possible reaction channels at low electron energies are discussed.     

Excitation of the 1s 2- and 1s 4-levels of neon and argon by He+-impact at energies between 100 keV and 1000 keV

The excitation of the 1s ₂- and 1s ₄-levels of neon and argon by He⁺-impact has been studied in the energy range of 100 keV to 1000 keV. The total emission cross sections for the 1s ₂ levels show pronounced maxima at about 350 keV impact energy, whereas the cross sections for the 1s ₄ levels increase with decreasing energy.     

类钠铜离子的激发自电离

在扭曲波库仑玻恩交换近似下计算了类钠铜离子２ｐ^６３ｓ＋ｅ^-→２ｐ⁵３ｓ３ｌ＋ｅ^-（ｌ＝０，１，２）的内壳层激发截面．结合单组态近似和组态相互作用两种情况下计算的自电离分支比，计算了上述组态的激发自电离截面．结果表明，在入射电子能量为１０９０ｅＶ时，组态相互作用使２ｐ⁵３ｓ３ｄ总的激发自电离截面增大至单组态近似的近两倍；而使２ｐ⁵３ｓ²组态的激发自电离截面减小为单组态近似的３６％；２ｐ⁵３ｓ３ｐ组态的激发自电离截面只是略有下降 关键词：     

The dissociative excitation of singlet levels of the singly charged lanthanum ion in collisions of electrons with lanthanum bromide molecules

The method of extended crossing beams was used to study inelastic collisions of slow electrons with LaBr₃ molecules. Dissociative excitation caused the appearance of spectral lines of the singly charged lanthanum ion. 38 dissociative excitation cross sections of LaII spectral lines (upper singlet levels) were studied at a 100 eV exciting electron energy. Three optical excitation functions were recorded over the electron energy range 0–100 eV. The cross sections obtained are compared with the data on dissociative excitation cross sections of the LaCl₃ molecule.     

The dissociative excitation of odd doublet cobalt atom levels in collisions of electrons with cobalt dichloride molecules

The extended crossed beam method was used to measure the dissociative excitation cross sections in e-CoCl₂ collisions for 91 transitions from odd doublet levels of cobalt atoms. The dissociative and direct CoI excitation cross sections were compared. Possible reaction channels at low electron energies were considered. The results were used to calculate the total dissociative excitation cross section of CoI levels at an exciting electron energy of 100 eV. For the z ² F°, z ² G°, and y ² G° levels, cascade population contributions were also determined.     

Dissociative Excitation of the Even Quartet and Sextet Levels of the Manganese Atom by Collisions of Electrons with Manganese Diiodide Molecules

Dissociative excitation of even quartet and sextet levels of the manganese atom by electron collisions with manganese diiodide molecules was studied experimentally. Twelve excitation cross-sections for transitions from quartet levels and 23 cross-sections for transitions from sextet levels were measured at an incident electron energy of 100 eV. The optical excitation function (OEF) was recorded in the range of electron energies 0?100 eV for transitions originating at the 3d⁵4s4de⁶D_J levels. The potential channels of dissociative excitation in the range of low electron energies (E < 22 eV) were discussed.     

Excitation cross sections of PtI transitions terminating at the levels of the low-lying 3 F term

Excitation of the transitions terminating at the levels of the low-lying ³ F term in the Pt atom was experimentally studied. Thirty-six excitation cross sections of PtI spectral lines in the spectral range from 197 to 417 nm were measured at an exciting-electron energy of 30 eV. Eleven optical excitation functions were detected in the electron energy range from 0 to 200 eV. Possible channels of excitation are discussed.     

Excitation cross sections of thulium atom transitions terminating at 4f13(2Fo)6s6p(3Po (7/2, J2) levels with J2 = 0, 1

The excitation of odd levels of the thulium atom, spontaneous transitions from which terminate at the 4f ¹³(² F ^o)6s6p(³ P ^o) (7/2, J ₂) levels with J ₂ = 0, 1, is studied by the method of extended crossing beams. Fifty four excitation cross sections are measured at an excitation electron energy of 50 eV. Seven optical excitation functions are recorded in the electron energy range of 0–200 eV.     

Excitation of even configurations of a nickel atom containing nine 3d electrons

The electron-impact excitation of even levels of the nickel atom belonging to configurations that contain nine 3d electrons is studied by the method of extended crossing beams. Ninety-six excitation cross sections are measured at an exciting electron energy of 50 eV. Seven optical excitation functions are recorded in the exciting electron energy range of 0–200 eV. Total excitation cross sections are determined for 24 energy levels of the nickel atom.     

Dissociative excitation of even levels of the singly charged yttrium ion in collisions of slow electrons with yttrium tribromide molecules

The method of extended crossing beams in conjunction with optical spectroscopy is used to study the dissociative excitation of even levels of YII in e-YBr₃ collisions. At the exciting electron energy of 100 eV, 38 dissociative excitation cross sections are measured. Comparison of these cross sections with the cross sections for direct excitation in e-Y collisions shows that, for all the investigated even levels of YII, dissociative excitation is more efficient than direct one.     

Excitation of even levels of erbium atoms without a change in the number of 4<Emphasis Type="Italic">f</Emphasis> electrons

The excitation of even levels of erbium atoms by slow electrons that occurs without a change in the number of electrons in the 4f shell is experimentally studied. The levels investigated belong to the 4f ¹²6s7s, 4f ¹²5d6s, 4f ¹²6s6d configurations. The cross sections measured at an electron energy of 30 eV lie within the range (0.2–18) × 10^?18 cm².     

Dissociative excitation of the odd quartet <Emphasis Type="Italic">S,P, D</Emphasis>, and <Emphasis Type="Italic">F</Emphasis> levels of the manganese atom in e-MnCl<Subscript>2</Subscript> collisions

The dissociative excitation of the ⁴ S°, ⁴ P°, ⁴ D°, and ⁴ F° levels of the manganese atom in collisions of slow electrons iwth manganese dichloride molecules is studied experimentally. It is found that the dissociative excitation cross sections for these levels are larger than the cross sections of direct excitation in the e-Mn collisions. The cross section ratios of the electron-atom and electron-molecule collisions, which characterize the effect of the chemical bond of the manganese atom with the halogen on the absolute excitation cross sections, are determined.