Analysis and transition probabilities of the B1Πu→X1Σg+ band system of Na2 excited by the 4579 Å Ar+ laser line

A study of the B1Πu→ X1Σ+gsystem of Na2

“…In addition table 1 lists calculated values of the relative population of the lower pumped rovibrational level at T = 500 • C, the calculated absorption Einstein coefficient for each laser excitation transition and the calculated and experimental lifetimes of the upper rovibrational levels populated by the corresponding excitation laser line. These results have been presented partially in previous publications [40][41][42][43][44][45][46][47][48]. An important motivation in these works was the analysis of LIF spectra with special emphasis on determination of precise fluorescence line intensities and comparison with calculated accurate radiative transition probabilities and lifetimes.…”

“…The present paper reports a new analysis of the B 1 u → X 1 + g system of the fluorescence spectrum of Na 2 excited by visible lines of an argon ion laser. Some of the results of this work have appeared in previous papers [40][41][42][43][44][45][46][47][48]. A total of 107 fluorescence series in the region 17 400-22 000 cm −1 have been observed and identified (∼4250 direct LIF lines and ∼1500 collisionally induced satellite lines assigned in the longest exposure traces).…”

“…The experimental setup and equipment used has been mostly described elsewhere [41]. Briefly, the fluorescence spectra of the B 1 u → X 1 + g band system were excited by visible Ar + laser (Spectra Physics Model 171) single lines ranging from 4545 to 5145 Å.…”

“…For the B 1 u → X 1 + g band system of Na 2 there are several theoretical [37] and experimental studies reporting the variation of the B 1 u → X 1 + g electronic transition dipole moment with internuclear distance based on line intensities [38] and from lifetimes measurements [39]. In previous publications, we have reported detailed experimental studies of the fluorescence spectrum of the Na 2 transition B 1 u → X 1 + g induced by nine Ar + laser lines: 4545.052 [40], 4579.349 [41], 4657.901 [42], 4726.868 [43], 4764.864 [44], 4879.863 [45], 4965.079 [46], 5017.163 [47] and 5145.308 Å [48] in air. An important motivation in these works was the detailed analysis (direct and satellite lines) of LIF spectra with special emphasis on determination of precise fluorescence line intensities and comparison with calculated accurate radiative transition probabilities and lifetimes.…”

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

“…Besides the discrete well-known B → X fluorescence [11][12][13][14] (blue-green region), a less intense A → X fluorescence (red-near infrared region) has been recorded. 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.…”