Electronic assignments of the violet bands of sodium

Pichler, Goran; Bahns, John T.; Sando, K. M.; Stwalley, William C.; Konowalow, Daniel D.; Li, L.; Field, Robert W.; Müller, Wolfgang

doi:10.1016/0009-2614(86)80372-4

Cited by 52 publications

(16 citation statements)

References 12 publications

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“…This kind of diffuse band has been observed under various excitation conditions in Li 2 ͑peaking at 458.5 nm͒, 14 Na 2 ͑peaking at 436.5 nm͒ 11 and K 2 ͑peaking at ϳ574 nm͒, 15 and in each case the origin was found to be 2 3 ⌸ g → a 3 ⌺ u + transitions. 11 The 2 3 ⌸ g → a 3 ⌺ u + 436 nm diffuse band of Na 2 has been observed whenever an A 1 ⌺ u + ͑or b 3 ⌸ u ͒ ← X 1 ⌺ g + transition was excited. 16 The 2 3 ⌸ g state was populated by collisions of two excited Na 2 molecules in the A 1 ⌺ u + ͑or b 3 ⌸ u ͒ state ͑energy pooling͒.…”

Section: Resultsmentioning

confidence: 96%

The K239 2Σg+3 state: Observation and analysis

Xie

et al. 2007

The Journal of Chemical Physics

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The (39)K(2) 2 (3)Sigma(g) (+) state has been observed by perturbation-facilitated infrared-infrared double resonance spectroscopy and two-photon excitation. Resolved fluorescence spectra into the a (3)Sigma(u) (+) state have been recorded. The observed vibrational levels have been assigned as the v=23-25, 27, 28, 31-33, 38-45, 47, and 53 levels by comparing the observed and calculated spectra of the 2 (3)Sigma(g) (+)-->a (3)Sigma(u) (+) transitions. Molecular constants have been obtained using a global fitting procedure with a comprehensive set of experimental data. Fine and hyperfine splittings have been resolved in the excitation spectra. Perturbations between the 2 (3)Sigma(g) (+) and 2 (3)Pi(g) states were observed. The hyperfine patterns of the 2 (3)Sigma(g) (+) levels are strongly affected by the perturbation. The perturbation-free and weakly perturbed levels follow the case b(betaS) coupling scheme, while the perturbed levels follow case b(beta J) coupling. A Fermi contact constant, b(F)=65+/-10 MHz, has been obtained. Intensity anomalies of rotational lines appeared both in the 2 (3)Sigma(g) (+) approximately 2 (3)Pi(g)<--b (3)Pi(u) excitation spectra and in the 2 (3)Sigma(g) (+) approximately 2 (3)Pi(g)-->a (3)Sigma(u) (+) resolved fluorescence spectra. These intensity anomalies can be explained in terms of a quantum-mechanical interference effect.

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Section: Resultsmentioning

confidence: 96%

The K239 2Σg+3 state: Observation and analysis

Xie

et al. 2007

The Journal of Chemical Physics

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“…2a was obtained with a sodium and zinc mole fraction ratio of 1/2.78 in the solid phase. We observed here only Na2 structures: a triplet diffuse band with peaks at 422 and 437 nm and the singlet interference continuum at 452 nm [3]. Figure 2b shows the spectrum obtained with the mole fraction ratio of Na and Zn of 1/5.67.…”

Section: Methodsmentioning

confidence: 86%

“…Based on a simple rateequation model, a comparison of the Na2 triplet band (23//g-13S + [3]) and the NaZn blue-green band intensities can yield the cross section for the process (1) relative to that of the process (2).…”

Section: Introductionmentioning

confidence: 99%

Cross section for the photochemical formation of the NaZn (22Π) excimer

Azinović

Milošević

Pichler

1996

Z Phys D - Atoms, Molecules and Clusters

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Abstract.We studied the conditions for the photochemical formation of the NaZn excimer in the excited 22//state using Naz(21//u) + Zn ~ NaZn(22//) + Na reaction. The N a -Z n vapor mixture was prepared in the heat-pipe oven with the well defined column density and temperature. The Na and Zn atom densities in the vapor mixture were controlled by the preparation of the alloy with different mole fraction ratios of the relevant components in the solid phase. The Na densities were determined from the total absorption coefficient at Nag X-B and X-A bands. The cross section for photochemical formation of the NaZn in the 22//state is estimated to be 17.10-16 c m 2 for the laser excitation at 308 rim, measured relative to the cross section of 470.10-16cm 2 for collisional energy transfer Naz(21//u) + Na ~Nai(23//g) + Na published by Mehdizadeh et al. [21.

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“…We found that chemically produced 02 (a1L5), (1) gives no enhancement in red emission via catalysis in the absence of chlorine, (2) gives no enhancement with (or without) addition of chlorine if no catalyst is present (3) gives no enhancement if chlorine is added after the catalytic converter, but does give enhancement if chlorine is added in front of the catalytic converter (4) gives no enhancement if elemental bromine or iodine is added to substitute the chlorine The only inference from these experiments will be that both surface catalysis and the presence of CL are prerequisites for the chemiluminescence enhancement In addition, we noticed the presence of a dark zone between the catalyst and where the red emission starts. This implies possible gas phase reaction(s) in addition to surface catalysis.…”

Section: Effect Of Different Catalystsmentioning

confidence: 97%