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.     

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 singlet levels of a singly charged scandium ion in e-Sc collisions

The excitation of singlet levels of the singly charged scandium ion is experimentally studied in collisions of slow electrons with scandium atoms. At the exciting electron energy of 30 eV, 59 excitation cross sections are measured. In the electron energy range of 0–200 eV, seven optical excitation functions are recorded. On the basis of these data the total excitation cross sections are calculated for 11 even and 9 odd levels of Sc II, as well as the contribution of cascade population to 8 even and 7 odd levels.     

Dissociative excitation of the singly charged manganese ion in collisions of electrons with manganese diiodide molecules

The dissociative excitation of the singly charged manganese ion in collisions of electrons with MnI₂ molecules is experimentally studied. At exciting electron energy of 100 eV, 16 dissociative excitation cross sections were measured. The studied transitions occur within the quintet and septet term systems in the absence of intercombination transitions. The measured values of the cross sections are compared to similar values obtained previously in studies of e–MnCl₂ and e–MnBr₂ collisions.     

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 Tm II from ground state of thulium atom

The electron-impact excitation of even levels of Tm II from the ground level of the thulium atom is studied by the method of extended crossing beams with recording the optical emission of excited ions. At the exciting electron energy of 50 eV, 54 excitation cross sections are measured. In the electron energy range of 0–200 eV, 12 excitation optical functions are recorded. The most probable channels of the excitation process are discussed.     

Dissociative excitation of even triplet and quintet levels of the iron atom in collisions of electrons with iron diiodide molecules

The method of extended crossing beams is used to study inelastic collisions of slow electrons with iron dichloride molecules. The dissociative excitation of even triplet and quintet levels of the iron atom at the incident electron energy of 100 eV is examined. The resulting dissociative excitation cross sections are compared to the cross sections of the excitation of FeI in electron-atom collisions.     

Excitation of even triplet levels of YII in the e-Y collisions

The excitation of high-lying triplet levels of a singly charged yttrium ion by electron-atom collisions is studied experimentally. The parity of the levels studied coincides with the parity of the initial state YI. Forty one excitation cross sections with simultaneous single ionization are measured for an exciting electron energy of 50 eV. The optical excitation functions (OEF) are recorded for the majority of transitions in the electron energy range 0–200 eV. The total cross sections are determined for 20 energy levels. Possible channels of a simultaneous excitation-ionization process are discussed.     

Excitation of quintet levels of the ytterbium atom by slow electrons

The excitation of transitions from upper quintet levels of the ytterbium atom is studied by the method of extended crossing beams. Seventy-five cross sections are measured at the excitation electron energy of 50 eV. Twelve optical excitation functions are recorded in the electron energy range from 0 to 200 eV.     

Dissociative excitation of odd quintet levels of the iron atom by collisions of electrons with iron dichloride molecules

The dissociative excitation of odd quintet levels of the iron atom by collisions of slow electrons with iron dichloride molecules was studied using the method of extended crossing beams. Fifty-five dissociative excitation cross sections were measured at an excitation electron energy of 100 eV. Five optical excitation functions were recorded over an electron energy range from 0 to 100 eV. Some tendencies in the behavior of dissociative excitation cross sections were discussed.     

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.     

Excitation of undecuplet levels of the gadolinium atom belonging to the 4f 75d 26p configuration

The electron-impact excitation cross sections for 104 transitions from undecuplet levels of the gadolinium atom are measured by the method of extended crossing beams with the exciting electron energy of 30 eV and recording an optical signal of excited atoms from the crossing region. In the electron energy range of 0-200 eV, 16 excitation optical functions are recorded.     

Electron impact excitation of high-lying states in the tungsten atom

The extended crossed-beam method has been used to study excitation of high-lying levels in the tungsten atom. 40 excitation cross sections of WI spectral lines have been measured for exciting electron energy 50 eV. Two optical excitation functions were recorded in the electron energy range 0–200 eV. The results obtained were used to calculate the total excitation cross sections of 24 odd WI energy levels. __________ Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 74, No. 3, pp. 283–288, May–June, 2007.     

Excitation of triplet <Emphasis Type="Italic">D</Emphasis> levels of barium atoms in collisions with electrons

The excitation of triplet D levels of the barium atom by slow electrons, which gives rise to optical emission due to spontaneous transitions from these levels, is experimentally studied. 85 excitation cross sections are measures at an exciting electron energy of 30 eV. 16 optical excitation functions are recorded within the electron energy range of 0–200 eV. The results obtained for seven transitions are compared with previously published experimental data.     

Excitation of the <Emphasis Type="Italic">G</Emphasis> and <Emphasis Type="Italic">H</Emphasis> levels of a Sc atom in collisions with slow electrons

The excitation of the G and H levels of a Sc atom by slow electrons was investigated experimentally. Thirty-six excitation cross sections of the Sc(I) spectral lines were measured at an electron energy of 30 eV. Fourteen optical excitation functions were recorded in the range of electron energies 0–200 eV. Most of the optical excitation functions have a complex structure. The magnitudes of the cross sections are compared with previous experimental data.     

Electron-impact excitation of triplet levels of the zinc atom

The excitation of transitions between the levels of the triplet system of the zinc atom is studied by the method of extended crossing beams. The absolute excitation cross sections are measured for electron energy of 30 eV and as functions of the incident electron energy in the range of 0–200 eV. It is found that, for all spectral lines, the dependence of the cross section on the principal quantum number of the upper level is a power function (without taking into account the leading lines of the series).     

Excitation of resonance transitions in a thulium atom by slow electrons

We experimentally studied the excitation of resonance transitions in a thulium atom in electron-atom collisions. At an electron energy of 50 eV, we measured 52 TmI excitation cross sections. We recorded 41 optical excitation functions in the electron energy range from the excitation threshold to 200 eV. The measured cross sections are, on average, a factor of 1.09 larger than their preceding experimental values but a factor of 2.41 smaller than their theoretical values.     

Dissociative excitation of even states of tin atoms in e-SnCl2 collisions

Dissociative excitation of even levels of tin atoms in collisions of slow electrons with tin dichloride molecules is studied experimentally. The levels studied belong to the configurations 5s ²5pnp ^{1, 3} L (n=6, 7; L=S, P, D) and 5s ²5p 4f. Absolute values of cross sections for dissociative excitation at the electron energy of 100 eV are 1.05–2.56 times greater than cross sections for excitation in electron-atom collisions at the energy of 50 eV.     

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.     

Dissociative excitation of doublet and octet levels of the manganese atom in collisions of electrons with manganese diiodide molecules

The dissociative excitation of doublet and octet levels of the manganese atom in collisions of slow electrons with manganese diiodide molecules is studied. At the exciting electron energy of 100 eV, the excitation cross sections for 28 and 12 transitions, respectively, from doublet and octet states of manganese atom are measured. In the exciting electron energy range of 0–100 eV, six optical excitation functions are recorded. The possible channels of the formation of excited manganese atoms at low electron energies are discussed.