Potential of the (5)Σ1g+ state of Na<sub>2</sub> by two-step excitation spectroscopy

G.-Y. Yan; B. W. Sterling; A. L. Schawlow

doi:10.1364/JOSAB.5.002305

Journal of the Optical Society of America B
Vol. 5,
Issue 11,
pp. 2305-2310
(1988)
•https://doi.org/10.1364/JOSAB.5.002305

Potential of the $(5) {{}^{1}Σ}_{g}^{+}$ state of Na₂ by two-step excitation spectroscopy

G.-Y. Yan, B. W. Sterling, and A. L. Schawlow

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G.-Y. Yan, B. W. Sterling, and A. L. Schawlow, "Potential of the (5)Σ1g+ state of Na₂ by two-step excitation spectroscopy," J. Opt. Soc. Am. B 5, 2305-2310 (1988)

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Abstract

The $(5) {{}^{1}Σ}_{g}^{+}$ state has been studied by two-step excitation spectroscopy. 270 levels in the state were measured with high resolution. A set of Dunham coefficients was deduced to fit all levels with v < 19. The spectroscopic data were used to construct a Rydberg–Klein–Rees potential for the state. The potential shows that the state is perturbed by other Rydberg states and ionic states and seems likely to have a second well that is due to avoided crossings with these states.

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T_e = 3.1765943 × 10⁴	Y₀₁ = 1.1133828 × 10⁻¹	Y₀₂ = −9.677073 × 10⁻⁸
Y₁₀ = 1.1371136 × 10²	Y₁₁ = −9.396707 × 10⁻⁴	Y₁₂ = −2.866194 × 10⁻⁸
Y₂₀ = −6.566551 × 10⁻¹	Y₂₁ = 2.9254831 × 10⁻⁵
Y₃₀ = 1.1615081 × 10⁻²	Y₃₁ = −1.384313 × 10⁻⁶
Y₄₀ = −5.033212 × 10⁻⁴

R (Å)	T (cm⁻¹)
2.25	37 082.93
2.50	35 675.91
2.75	34 607.87
3.00	33 043.29
3.25	32 171.14
3.50	31 803.86
3.75	31 797.72
4.00	32 003.58
4.25	32 347.92
4.50	32 762.94
4.75	33 197.17
5.00	33 609.25
5.25	33 933.28
5.50	34 166.71
5.75	34 340.96
6.00	34 481.62
6.25	34 606.04
6.50	34 726.83
6.75	34 851.63
7.00	34 975.62
7.25	35 083.62
7.50	35 170.84
7.75	35 242.87
8.00	35 303.59
8.25	35 348.73
8.50	35 375.09
8.75	35 388.55

T_e = 3.1765943 × 10⁴	Y₀₁ = 1.1133828 × 10⁻¹	Y₀₂ = −9.677073 × 10⁻⁸
Y₁₀ = 1.1371136 × 10²	Y₁₁ = −9.396707 × 10⁻⁴	Y₁₂ = −2.866194 × 10⁻⁸
Y₂₀ = −6.566551 × 10⁻¹	Y₂₁ = 2.9254831 × 10⁻⁵
Y₃₀ = 1.1615081 × 10⁻²	Y₃₁ = −1.384313 × 10⁻⁶
Y₄₀ = −5.033212 × 10⁻⁴

R (Å)	T (cm⁻¹)
2.25	37 082.93
2.50	35 675.91
2.75	34 607.87
3.00	33 043.29
3.25	32 171.14
3.50	31 803.86
3.75	31 797.72
4.00	32 003.58
4.25	32 347.92
4.50	32 762.94
4.75	33 197.17
5.00	33 609.25
5.25	33 933.28
5.50	34 166.71
5.75	34 340.96
6.00	34 481.62
6.25	34 606.04
6.50	34 726.83
6.75	34 851.63
7.00	34 975.62
7.25	35 083.62
7.50	35 170.84
7.75	35 242.87
8.00	35 303.59
8.25	35 348.73
8.50	35 375.09
8.75	35 388.55

Abstract

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Equations (1)

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