The NaHg spectrum revisited: An analysis of the NaHg A2Π state and double-well B2Σ state

Production of the NaHg Molecule by Reactive Three-Body Collisions following Energy-Transferring Processes of Laser-Excited Na(3 2P) Atoms

“…Figure 4 presents detailed fluorescence spectra of the wavelength regions 639-710 (a) and 420-490 nm (b), using the 1200 grooves/mm grating at the same experimental conditions as in Figure 3. The S i assignments in Figure 4a are given in accordance with Schlejen et al 9 Oscillations S 1 , S 2 , S 3 , and S 4 are identified to originate in the transitions NaHg(II 1/2 -X 1/2 ), of which oscillation S 1 is of pure bound-free (bf) and S 3 of pure bound-bound (bb) character, whereas oscillations S 2 and S 4 represent convolutions of both bound-free and bound-bound emissions. 7 Since the NaHg red bands in these experiments are congested with fluorescence on the Na D-line wing, we decline to analyze these bands.…”

“…The excited sodium atoms experience reactive three-body collisions that result in the production of NaHg(II 1/2 ) molecules, according to Na(3 2 P) + Hg(6 1 S 0 ) + M f NaHg(II 1/2 ) + M (4) where M represents any third collision partner needed to conserve energy and momentum. Schlejen et al 9 previously reported the observation of NaHg red bands upon excitation of one of the D-lines. In addition to reaction 4, the excited Na(3 2 P 3/2 ) atoms participate in energy-transferring collisions according to Na(3 2 P 3/2 ) + Na(3 2 P 3/2 ) 98 k 1 Na(5 2 S) + Na(3 2 S 1/2 ) (5) Na(3 2 P 3/2 ) + Na(3 2 P 3/2 ) 98 k 2 Na(4 2 D) + Na(3 2 S 1/2 )…”

Rotational Analysis of the LiHg 22Π3/2–X2Σ+1/2 (v′ = 0 ← v" = 0, 1, 2) Vibronic Bands

“…In the fit the energy term values for the excited electronic states (vЈ ϭ 0, 1) are represented by Eqs. [5], [6], and [7]. For the ground electronic state the energy term values are represented as the sum of two terms: a spin-rotation coupling term and the Dunham coefficients for the ground electronic state:…”

“…Visible emission from the alkali-IIb molecules was also observed by photoassociation or three-body collision processes (3,4). So far most of the work on the alkali-IIb intermetallic molecules was carried out under heat-pipe conditions, with a few studies in high-pressure arc lamps such as NaHg (5).…”

The LiHg(22Π3/2− ) System

“…Consequently, several experimental and theoretical results have been published on this topic. [1][2][3][4][5][6][7][8][9][10][11][12][13][14] Among the molecules composed of Li and an element of the IIb group, blue-green bands of LiZn and LiCd were observed by Milosevic et al 15 and van Hemert et al 16 Previously we reported the observation of LiHg blue-green bands and presented ab initio calculations of the corresponding potential curves. 17,18 Subsequent experiments exploiting excitation of the Li-Li 2 -Hg vapor mixture with CW-dye laser radiation revealed the importance of LiHg(2 2 Π 3/2 -X 2 Σ 1/2 + ) bound-bound transitions.…”