New spectroscopic constants and RKR potential for the A 1Σu+ state of Na2

Abstract

Analysis of high vibrational level data obtained in modulated population spectroscopy leads to more accurate spectroscopic constants for the A 1Σu+ state of Na2. A new method of solving the RKR integrals leads to quick, accurate calculation of the potential.

Relative Einstein coefficients and dipole moments of the transitions measured in oxygen atom recombination accompanied by radiation

“…The RKR turning points of the states discussed were calculated by a method of Kaminsky (1977) using the spectroscopic constants mentioned above. Extrapolation outside the range of the RKR curves was done by fitting the smallest Lennard-Jones r −12 and largest Morse potentials.…”

The LiHg(22Π3/2− ) System

“…Moreover, the experimental parameters necessary for producing LiHg in a reasonable amount, i.e., high temperature and a high buffer gas pressure, cause difficulties in observing rotationally resolved fluorescence spectra. Therefore, we confine ourselves to an experimental determination of vibrational molecular parameters, which we use in a next step to compute a RKR potential curve according to Kaminsky . An application of this method seems safe since the f integrals in the RKR method with k = h /2π(2 hc μ) 1/2 , r - and r + inner and outer turning points, and G ( v ) vibrational term energy, depend on the vibrational parameters only.…”

“…Therefore, we confine ourselves to an experimental determination of vibrational molecular parameters, which we use in a next step to compute a RKR potential curve according to Kaminsky. 32 An application of this method seems safe since the f integrals in the RKR method with k ) h/2π(2hcµ) 1/2 , rand r + inner and outer turning points, and G(V) vibrational term energy, depend on the vibrational parameters only. The vibrational quantum number V min is defined by with the Dunham correction for the zero-point energy given by If the repulsive part of a potential curve is known, the widths of the bound part of the potential curve, determined by the f integrals in eq 5, can be used to calculate the outer turning point r + simply by adding the width (r +r -) to the value of the inner turning point r -.…”

On the 1(A)1Σ+u→ 1(X)1Σ+gemission of Na2observed following the laser excitation of the 1(B)1Πustate

“…The same value for the bandwidth was considered for all rovibrational lines within a (ν , ν ) vibrational band. In fitting the spectrum, the Dunham coefficients for the electronic states involved in the band system were needed ( [1,14,[24][25][26]). Spectrum simulations are based on comparison of calculated and experimental spectra for different values of the data (spectroscopic parameters, population distributions .…”

“…Detailed studies on spectral line intensities from laser-induced fluorescence (LIF) spectra excited by using nine Ar + laser lines (4545.052 [15], 4579.349 [16], 4657.901 [17], 4726.868 [18], 4764.864 [19], 4879.863 [20], 4965.079 [21], 5017.163 [22] and 5145.308 [23] Å in air) combined with calculations of transition probabilities have been made in our laboratory for the B → X band of Na 2 . The A → X band profile ( [24][25][26][27]) was studied as a function of the excitation wavelength, cell temperature and buffer gas pressure. Depending on the cell temperature and the laser power, D 1 and D 2 atomic lines of Na are seen either as sharp emission features or as absorption on the molecular background.…”