Oscillator strengths of neutral and singly ionised molybdenum

Abstract

Abstract--Oscillator strengths of 174 Mo(I) and 58 Mo(II) lines in the range 247~5570 A were obtained from wall-stabilised arc and hollow cathode measurements. Sets of relative f-values were determined by a combination of hook and emission measurements requiring no assumptions concerning the plasma state. The sets have been enlarged considerably by evaluating spectra recorded with a Fourier spectrometer. The relative Mo(I)f-values were converted to an absolute scale by means of radiative lifetimes measured by P. Zimmermann and his group. The overall uncertainties are within 10-35~i. Since lifetimes of Mo(II) levels are not yet available, only relative Mo(II) f-values are presented.

Radiative decay of the 4d5(6S)5p z5,7Po states in Tc II: comparison along the homologous and isoelectronic sequences. Application to astrophysics

“…The CP2 lifetimes are definitely too long in Re ii and Mo i . In these two species, the CP1 core‐polarization model reproduces reasonably well our laser LIF measurements and those of Kwiatkowski et al (1981) and Schnehage et al (1983). In Tc ii , our CA calculations support also the CP1 lifetimes.…”

“…g LIF (Kwiatkowski et al 1981). h LIF measurements of Zimmermann et al reported as a private communication by Schnehage et al (1983).…”

“…The lack of experimental and theoretical radiative rates in Tc ii has led us to consider three different independent semi‐empirical or theoretical approaches, namely the pseudo‐relativistic Hartree–Fock method of Cowan (1981) with a core‐polarization (CP) model potential (HFR + CP), the Coulomb approximation (CA) of Bates & Damgaard (1949) and a multiconfigurational Breit‐Pauli approximation using a scaled Thomas–Fermi potential implemented in the AUTOSTRUCTURE code (Badnell 1986, 1997). Moreover, assessment of the methods used was done by comparing calculations made in similar conditions along the homologous and isoelectronic sequences for ions for which reliable lifetime measurements obtained by laser‐induced fluorescence (LIF) techniques were available, that is, Mn ii (Pinnington et al 1992), Re ii (Palmeri et al 2005b) and Mo i (Kwiatkowski et al 1981; Schnehage et al 1983).…”

Lifetime measurements and transition probabilities in Mo II

“…The first results were the arc measurements of Corliss and Bozman (1962), but these results are now known to be affected by large systematic errors and they have been superseded by more recent data. Schnehage et al (1983) determined relative f -values for 174 Mo I and 58 Mo II transitions in the range 24.7-557.0 nm from wall-stabilized arc and hollow cathode measurements. The Mo I data were normalized to an absolute scale using four experimental lifetime values from Kwiatkowski et al (1981).…”

Experimental radiative lifetimes, branching fractions, and oscillator strengths of odd-parity levels in Mo I

“…Transition probabilities for 570 Mo I lines in the range of 294.4-976.7 nm belonging to 56 levels with an energy range of 25; 614-42; 345 cm −1 were deduced from combining experimental lifetimes and their branching fractions by Whaling et al [9]. Oscillator strengths of 174 Mo I lines ranging from 247 to 557 nm were obtained from wall-stabilized arc and hollow cathode measurements by Schnehage et al [10].…”