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Collisional transfer of population and orientation in NaK
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10.1063/1.3575234
/content/aip/journal/jcp/134/17/10.1063/1.3575234
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/17/10.1063/1.3575234

Figures

Image of FIG. 1.
FIG. 1.

Rb2 A 1Σ u +X 1Σ g + spectrum recorded using polarization spectroscopy showing collisional transfer of population and orientation with |ΔJ| up to 58. The pump laser was tuned to the B 1Π u (v = 2, J = 70) ← X 1Σ g +(v = 0, J = 71) transition, creating orientation in the X 1Σ g +(v = 0, J = 71) level. The probe laser was scanned over the various A 1Σ u +(v , J ) ← X 1Σ g +(v = 0, J ) transitions. Signals could be identified for collisionally populated ground state levels with .

Image of FIG. 2.
FIG. 2.

Experimental setup. The white light and monochromator are used in measurements of atomic potassium density using the absorption equivalent width technique.

Image of FIG. 3.
FIG. 3.

Energy level diagram for fluorescence experiment. The frequency of the pump laser is fixed to line center of the A 1Σ+(v′ = 16, J′ = 30) ← X 1Σ+(v″ = 0, J″ = 29) transition. The frequency of the probe laser is scanned over the “direct” line 31Π(v = 6 or 7, J = 29) ← A 1Σ+(v′ = 16, J′ = 30) and over the “collisional” lines 31Π(v = 6 or 7, J = 29 + ΔJ) ← A 1Σ+(v′ = 16, J′ = 30 + ΔJ). Excitation is detected by monitoring total violet 31Π → X 1Σ+ fluorescence.

Image of FIG. 4.
FIG. 4.

A comparison of fluorescence (lower trace) and polarization spectroscopy (upper trace) signals showing collisional lines corresponding to ΔJ = ±1, ±2, ±3, ±4. The direct lines (ΔJ = 0) go far off scale in both traces.

Image of FIG. 5.
FIG. 5.

Illustration of absorption of left and right circularly polarized light giving rise to the polarization spectroscopy signal. Arrows labeled F L and F R represent probe laser absorptions for left and right circularly polarized light, respectively, and the represent absorption coefficients.

Image of FIG. 6.
FIG. 6.

Fluorescence data R F vs n Ar for ΔJ = +2, with the potassium density fixed at (a) n K = 4.1  × 1014  cm−3; (b) n K = 1.8 × 1015  cm−3; (c) n K = 5.1 × 1015  cm−3; and (d) n K = 8.7 × 1015  cm−3; and as a function of n K for data obtained in the heat pipe mode (e).

Image of FIG. 7.
FIG. 7.

Polarization data R P vs n Ar for ΔJ = +2, with the potassium density fixed at (a) n K = 3.2 × 1014  cm−3; (b) n K = 1.8 × 1015  cm−3; (c) n K = 5.1 × 1015  cm−3; and (d) n K = 8.7 × 1015  cm−3.

Image of FIG. 8.
FIG. 8.

Fitted values of (a) and (b) plotted against ΔJ.

Image of FIG. 9.
FIG. 9.

Fitted values of (a) and (b) plotted against ΔJ.

Image of FIG. 10.
FIG. 10.

Plot of the homogeneous linewidths of the “direct” probe transition, 31Π(v = 7, J = 29) ← 2(A)1Σ+(v′ = 16, J′ = 30), as a function of argon density, for n K = 5.1 × 1015 cm−3. The slope of the least-squares straight line fit of these data is (7.05 ± 0.11) × 10−9 cm3 s−1 and the intercept is (5.96 ± 0.08) × 108 s−1.

Image of FIG. 11.
FIG. 11.

n Ar = 0 intercepts of the homogeneous linewidths vs argon density of the “direct” probe transition, 31Π(v = 7, J = 29) ← 2(A)1Σ+(v′ = 16, J′ = 30), plus linewidths recorded in heat pipe mode, plotted as a function of potassium density. The slope of the least-squares straight line fit of these data is cm3 s−1 with an intercept of (3.2 ± 0.3) × 108 s−1.

Image of FIG. 12.
FIG. 12.

Velocity changes (as manifested in additional Doppler broadening of collisional lines) due to (a) argon collisions and (b) potassium collisions.

Image of FIG. 13.
FIG. 13.

level population distribution in the intermediate 2(A)1Σ+(v = 16, J = 30) level calculated using the density matrix equations of motion for the NaK OODR transition 31Π(v = 7, J = 29) ← 2(A)1Σ+(v = 16, J = 30) ← 1(X)1Σ+(v = 0, J = 29). (a) Pump laser power 100 mW, probe laser power 0 mW. Net orientation . (b) Pump laser power 100 mW, probe laser power 1 mW. Net orientation . The conditions of case (b) are similar to those used in the present experiment.

Tables

Generic image for table
Table I.

f(J, J′) values for 1Σ → 1Σ and 1Σ → 1Π transitions.

Generic image for table
Table II.

Parameters obtained from empirical global fit to the data, using Γ = 4.4 × 107 s−1.

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/content/aip/journal/jcp/134/17/10.1063/1.3575234
2011-05-02
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Collisional transfer of population and orientation in NaK
http://aip.metastore.ingenta.com/content/aip/journal/jcp/134/17/10.1063/1.3575234
10.1063/1.3575234
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