Electric Quadrupole Interaction Constants Research Articles

Исследование схемы селективной фотоионизации -=SUP=-177-=/SUP=-Lu

AbstractThe hyperfine structure of transitions in the three-step scheme 5 d 6 s ^22 D _3/2–5 d 6 s 6 p ^4 F $$_{{5/2}}^{^\circ }$$ –5 d 6 s 7 s ^4 D _3/2– (53 375 cm^–1) $$_{{1/2}}^{^\circ }$$ of lutetium ionization is studied for ^175Lu, ^176Lu, and ^177Lu isotopes using the photoionization laser spectroscopy method. Values of the magnetic dipole ( A ) and electric quadrupole ( B ) interaction constants are determined, as well as the energies, the isotope shifts, and the radiative lifetimes for the 5 d 6 s 7 s ^4 D _3/2 and (53 375 cm^–1) $$_{{1/2}}^{^\circ }$$ levels.

Study of a Selective Photoionization Scheme of 177Lu

The hyperfine structure of transitions in the three-step scheme 5d6s22D3/2–5d6s6p4F $$_{{5/2}}^{^\circ }$$ –5d6s7s4D3/2– (53 375 cm–1) $$_{{1/2}}^{^\circ }$$ of lutetium ionization is studied for 175Lu, 176Lu, and 177Lu isotopes using the photoionization laser spectroscopy method. Values of the magnetic dipole (A) and electric quadrupole (B) interaction constants are determined, as well as the energies, the isotope shifts, and the radiative lifetimes for the 5d6s7s4D3/2 and (53 375 cm–1) $$_{{1/2}}^{^\circ }$$ levels.

Investigation of the hyperfine structure of 143Nd+ spectral lines using collinear laser ion beam spectroscopy

The high resolution technique of collinear laser ion beam spectroscopy is used to determine the hyperfine structure constants of 6 metastable even-parity levels (E < 10 000 cm−1) and 19 odd-parity levels (E < 27 000 cm−1) of 143Nd+. The magnetic dipole interaction constants A and the electric quadrupole interaction constants B were determined with high accuracy. For six levels the hyperfine interaction constants were measured for the first time.

Optogalvanic spectroscopy of the hyperfine structure of weak La I lines: discovery of new even parity fine structure levels

The hyperfine structure of weak La I lines was experimentally investigated using laser optogalvanic spectroscopy in a hollow cathode discharge lamp. More than 100 La I lines were investigated and 40 new energy levels were discovered, most of them having even parity. The magnetic hyperfine interaction constants A and in some cases the electric quadrupole interaction constants B for these levels were determined. All the newly discovered levels were confirmed either by additional laser excitations (from other known levels) or by lines in a Fourier transform spectrum which could now be classified.

A study of hyperfine transitions of singly ionized praseodymium (141Pr+) using collinear laser ion beam spectroscopy

54 spectral lines of singly ionized praseodymium (141Pr+) have been investigated using the high resolution spectroscopic method of collinear laser ion beam spectroscopy (CLIBS). Magnetic dipole interaction constants A and electric quadrupole interaction constants B of 49 involved levels could be determined. 19 levels are investigated for the first time using this technique. The A-values could be determined with uncertainties less than 1 MHz.

Submillimeter-wave spectra of hypoiodous acid.

Pure rotational spectra of hypoiodous acid, HOI, and its deuterated species, DOI, were measured in the frequency range of 320-670 GHz. The molecule was efficiently produced by a reaction of atomic oxygen with iodoethane. Rotational constants and centrifugal distortion constants for the molecule were determined accurately. The vibrationally averaged structure for HOI was obtained by taking the isotopic difference of the OH bond length into consideration: r(z)(OH)=0.967(8) A, r(z)(OI)=1.9941(3) A, and theta(z)(HOI)=103.89 degrees, where the errors were estimated from the residual inertial defect. Equilibrium bond lengths for the OH and OI bonds were derived as 0.959(8) A and 1.9874(3) A, respectively, by assuming anharmonic constants of the corresponding diatomic molecules. Electric-quadrupole interaction constants and nuclear-spin-rotation coupling constants for the iodine nucleus were obtained. Nonaxial terms of the electric-quadrupole constant for HOI can be determined as well, which enabled us to derive the principal values of the coupling tensor. The values obtained were used to gauge the ionicity of the X-O bond in the HOX molecular system. The nuclear-spin-rotation coupling constant along the a inertial axis is found to be significantly smaller than others, which may be explained by a contribution from two low-lying singlet excited states.

Investigation of the Hyperfine Structure of Ta I lines (VIII)

The hyperfine structures of 57 new spectral lines of the tantalum atom were investigated by means of laser excitation. From the hyperfine patterns we have determined the angular momenta J, the magnetic hyperfine interaction constants A and the electric quadrupole interaction constants B of 15 new energy levels of even parity and three new levels of odd parity. The observation of laser-induced fluorescence led to the classification of further 156 spectral lines for the first time. Additionally 92 lines, observed in high resolution Fourier transform spectra, were classified using a combination of their wavenumbers and their characteristic hyperfine patterns.

Laserspectroscopic Investigation of the Hyperfine Structure of Ta II-lines

The hyperfine structure of 39 lines of the singly charged tantalum ion was investigated by means of dopplerlimited laser spectroscopy. From the spectra we have deduced the magnetic hyperfine interaction constants A and the electric quadrupole interaction constants B of 22 levels with even parity and 17 levels with odd parity.

Investigation of the Hyperfine Structure of Ta I lines (VII)

We have classified about 400 new spectral lines of neutral tantalum via laser excitation or observation of laser-induced fluorescence. 37 energy levels with even parity and seven levels with odd parity were found by means of systematic hyperfine structure investigations. For the new levels angular momentum, parity, magnetic hyperfine interaction constant A and electric quadrupole interaction constant B were deduced. In addition, we have classified 230 new lines observed in high resolution Fourier transform spectra by analysing their observed hyperfine structure patterns.

Investigation of the hyperfine structure of Ta I-lines (IV)

The hyperfine structure of about 200 lines of the neutral tantalum atom was investigated by means of Doppler limited laser spectroscopy. From the spectra we have deduced the magnetic hyperfine interaction constants A and the electric quadrupole interaction constants B of 8 levels with even parity and 81 levels with odd parity. Further, we have discovered 24 new levels of even parity and 11 new levels of odd parity.

Hyperfine structure studies of Tantalum

A narrow bandwidth ring dye laser pumped by an argon ion laser has been used to investigate the hyperfine structure of the even and odd parity levels of tantalum by optogalvanic spectroscopy in the wavelength range 5640 to 6050 A. Seventeen transitions have been observed and eight of these have not been reported in the literature so far. These transitions involve 27 levels with 15 odd and 12 even parity configurations. The magnetic dipole hyperfine interaction constants A and the electric quadrupole interaction constants B for these levels have been computed and compared with the data available in literature. The results for the levels at 34799.71 cm−1, 26960.46 cm−1 and 19657.78 cm−1 are reported for the first time.

Investigation of the hyperfine structure of TaI-lines

The hyperfine structure of several spectral lines of the neutral tantalum atom was investigated by means of saturated optogalvanic laser spectroscopy. From the spectra, we have determined the magnetic hyperfine interaction constants A and the electric quadrupole interaction constants B of 14 levels with even parity and 23 levels of odd parity.

Hyperfine structure measurements in tantalum I using laser saturation spectroscopy in a sputtered vapour

Magnetic hyperfine interaction constants (A factors) and electric quadrupole interaction constants (B factors) have been determined for sixteen levels in tantalum I using the method of saturated absorption spectroscopy in a sputtered vapour. Five of these levels belong to the lowest configuration 5d 3 6s 2 which has been studied previously by other workers, and for one of these levels, thea 4 P 5/2 at 9253 cm−1, our results are new. For the eleven levels belonging to the excited configurations 5d 3 6s 6p and 5d 2 6s 2 6p our values are the first data reported in the literature.

High precision laser-RF spectroscopic measurements of the hyperfine structure of vanadium-51

The hyperfine structure (HFS) of the four high lying, metastable atomic states 3d 4 4s 2H 9 2 11 2 and 3d 3 4s 2 2D 3 2 5 2 of V-51 have been measured. The measurements are carried out using the ABMR-LIRF method (atomic beam magnetic resonance, detected by laser induced resonance fluorescence). The magnetic dipole and the electric quadrupole interaction constants A, B have been obtained from these measurements.

Laser optogalvanic spectroscopy of holmium

The optogalvanic spectrum of the neutral holmium atom (Ho i) is investigated with both broadband and single-frequency cw dye lasers and a hollow-cathode lamp. Many new Ho i transitions are observed, and their possible classifications are reported. The hyperfine structure of 165Ho (I = 7/2) is recorded in a number of spectral lines, and the data are analyzed to evaluate the magnetic dipole and electric quadrupole interaction constants (A and B factors, respectively) for energy levels of Ho i. The A and B constants for nine excited states, five of which belong to the 4f116s7p high-lying even configuration of Ho i, are reported for the first time to our knowledge.

Newly observed lines and hyperfine structure in the infrared spectrum of indium obtained by using a Fourier-transform spectrometer

The spectrum of neutral indium has been studied in the infrared region by means of the Fourier-transform spectrometer at the Laboratoire Aime Cotton, Orsay, France. A microwave-excited discharge tube containing indium iodide was used as the light source. A total of ten hyperfine structures was studied. Precise measurements of the center of gravity of the structures give energy levels with an error less than 0.005 cm−1. Complete analysis of these hyperfine structures resulted in the determination of the magnetic-dipole and electric-quadrupole interaction constants for one odd and four even levels. The observation also resulted in the measurements of 57 lines in the region of 0.86–4.0 μm, and, of these, 41 lines were observed for the first time to our knowledge.

Hyperfine-structure study of the 3d105p 2P3/2 level of neutral copper using pulsed level-crossing spectroscopy at short laser wavelengths.

A hyperfine-structure study of the strongly perturbed 3${d}^{10}$5p $^{2}P_{3/2}$ state of neutral copper was performed using pulsed level-crossing spectroscopy. Excitation was accomplished at the short wavelength of 202 nm, where intense laser pulses were obtained using frequency tripling of dye laser radiation. For $^{63}\mathrm{Cu}$ we obtained a=61.7(9) MHz, b=4.9(7) MHz, and \ensuremath{\tau}=25.5(10) ns for the magnetic dipole and the electric quadrupole interaction constants and the lifetime, respectively. A comparison with theoretical calculations based on the multiconfiguration Hartree-Fock method is made. A discussion of the usefulness of level-crossing, quantum-beat, and radio-frequency techniques for high-resolution spectroscopy at wavelengths in the uv and vacuum-uv region is presented.

Measurements of magnetic-dipole and electric-quadrupole interaction constants of the 11, 12 and 132D5/2 states in 87Rb by the quantum-beat method

Hyperfine structure in three n2D5/2 states (n=11, 12 and 13) of 87Rb was investigated by the quantum-beat method in zero magnetic field. The states of interest were excited by two-photon absorption from a single hyperfine substate (with F=1) of the ground state. The magnetic-dipole interaction constant A and the electric-quadrupole interaction constant B were obtained by analysis of the modulation frequencies of the fluorescence signals (transition n2D5/2-52P3/2). The results (MHz) are as follows: mod A(112D5/2) mod =0.361(7), mod B(112D5/2) mod =0.071(11), mod A(122D5/2) mod =0.266(9), mod B(122D5/2) mod =0.063(14), mod A(132D5/2) mod =0.20(1), mod B(132D5/2) mod =0.05(2). For all the states, A and B differ in sign. The effective lifetimes obtained as a by-product of the experiment are also presented.

Hyperfine-structure measurements in bismuth using a Fourier-transform spectrometer

The spectrum of neutral bismuth has been studied in the infrared region by means of the Fourier-transform spectrometer at the Laboratoire Aimé Cotton, Orsay, France. A microwave-excited discharge tube containing bismuth iodide was used as the light source. A total of 37 hyperfine structures was studied. Precise measurements of the center of gravity of the structures give energy levels with an error less than 0.005 cm−1. Complete analysis of these hyperfine structures resulted in the determination of the magnetic-dipole and the electric-quadrupole interaction constants for 10 even and 12 odd levels. The present results have increased the number of newly classified lines to 78, as compared with 28 reported in our earlier work [ J. Opt. Soc. Am.72, 589 ( 1982)]. The analysis has also resulted in the confirmation and the assignment of many J values, improved values of energy levels, and two new levels.

Hyperfine structure of the 7p2P1/2,3/2 levels of115In and the 5p2P1/2 level of27Al

The hyperfine structure of the 7p2P1/2,3/2 levels of115In and the 5p2P1/2 level of27Al has been measured using high-resolution laser spectroscopy on atomic beams. For the magnetic-dipole and electric-quadrupole interaction constants,a andb, the following values were obtained;a(7p2P1/2)=90.7(10) MHz,a(7p2P3/2)=32.3(2) MHz andb(7p2P3/2)=24.5(1.5) MHz for115In anda(5p2P1/2)=20(2) MHz for27Al. Many-body calculations on2P states in aluminum, gallium and indium have also been performed.