The Green Auroral Line as an Initiator of Phosphorescence in Condensed Systems

Absorption of Sunlight by Atmospheric Sodium

“…On the basis of the ehemical reactions described above, having regard to the vertical distribution or 0 and ° CHAPMAN (11) 3 , suggested an exponential distribution for the free sodium with an abrupt decrease in density at the lower edge. (13) led to the postulation of the existence of a layer screening the solar radiation at ~4km and the con clusion that this layer was the upper limit or the ozone which would absorb sunlight in the 2000-3000A region and therefore that the twilight excitation of the sodium was due to ultra-violet radiation. However, BRICARD& KASTLER (14) (15) (16) were able to show that the sodium was excited by yellow light and that the absorption of the yellow solar radiation should be considered in finding an effective screening due to attenuation in the lower layers of the atmosphere.…”

Émission de l'oxygène dilué dans une atmosphère de xénon

“…Une bande analogue, mais beaucoup moins intense a été trouvée précédemment dans un mélange d'argon et d'oxygène [3]. Ce résultat a été confirmé récemment par Vegard qui semble ignorer ce travail [4]. L'intérêt de ces bandes réside dans ce qu'elles permettent de jeter un jour nouveau sur les expériences effectuées, il y a une vingtaine d'années, sur l'origine de l'émission de la raie verte des aurores.…”

Neutron-Proton Capture and Coherent Scattering Amplitudes

“…P ENNDORF 1 has recently proposed a new mechanism to explain the twilight luminescence of atmospheric sodium. This was done mainly in order to account for certain experimental results, found by Vegard and Kvifte,2 which are hard to interpret on the usual theory. Unfortunately the new process itself raises great difficulties.…”