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See detailA strong infrared radiation from molecular nitrogen in the night sky.
Stebbins, Joël; Whitford, A.-E.; Swings, Polydore ULg

in Astrophysical Journal (1945), 101

A new infrared radiation has been detected in the night sky, which is far more intense than the ordinary persistent aurora giving the green line at 5577 A. Measured with a photocell and filters, the wave ... [more ▼]

A new infrared radiation has been detected in the night sky, which is far more intense than the ordinary persistent aurora giving the green line at 5577 A. Measured with a photocell and filters, the wave length of the new radiation is 10,440 ± 25 A. This night-sky radiation is identified with the (0, 0) band of the first positive group B3∏→ A3∑ of N2. The absence of other N2 bands suggests that emission of the (0, 0) band involves conversion of the energy of dissociation D(N2) into excitation in a three-body collision: N + N + N2 → N2 + N2exc. Since D(N2) is a little larger than the excitation energy of B3∏, υ' = 0, but smaller than B3∏, υ' = 1, only the bands arising from B3∏, υ' = 0, would be excited; and of the latter, only (0, 0) is observable. This mechanism implies the presence of a large number of nitrogen atoms in the high atmosphere. It can be effective only with the value 7.38v. of D(N2) advocated by Herzberg and Sponer. [less ▲]

Detailed reference viewed: 18 (1 ULg)
Full Text
See detailA strong infrared radiation from molecular nitrogen in the night sky.
Stebbins, Joel; Whitford, A.-E.; Swings, Polydore ULg

in Contributions from the Mount Wilson Observatory (1945), 703

A new infrared radiation has been detected in the night sky, which is far more intense than the ordinary persistent aurora giving the green line at 5577 A. Measured with a photocell and filters, the wave ... [more ▼]

A new infrared radiation has been detected in the night sky, which is far more intense than the ordinary persistent aurora giving the green line at 5577 A. Measured with a photocell and filters, the wave length of the new radiation is 10,440 ± 25 A. This night-sky radiation is identified with the (0, 0) band of the first positive group B3∏ → A3Σ of N2. The absence of other N2 bands suggests that emission of the (0, 0) band involves conversion of the energy of dissociation D(N2) into excitation in a three-body collision: N + N + N2 → N2 + N2exc . Since D(N2) is a little larger than the excitation energy of B3∏, ν' ≈ 0, but smaller than B3∏, υ' = 1, only the bands arising from B3∏, υ' = 0, would be excited; and of the latter, only (0, 0) is observable. This mechanism implies the presence of a large number of nitrogen atoms in the high atmosphere. It can be effective only with the value 7.38v. of D(N2) advocated by Herzberg and Sponer. [less ▲]

Detailed reference viewed: 28 (1 ULg)