Die sogenannte zweite positive Gruppe des Stickstoffspektrums

Abstract

w 1. Es werden neue Messungen der Rotationsstruktur der Banden 0--~ 0, ] --~ 0, 2 --> 3, 3 --> 3, 4 ---> 2 und 4 --~ 4 gebracht. w 2. Diese Banden sind 3//_~ 3 H_ Uberg~inge; in beiden Zust~nden _~iir kleine J-Werte n~iher zum Fall a, ~fir gro[te J-Werte n~iher zum Fall b. Es werden die Rotationskonstanten des //v->//1-1_~berganges und eine Nullinienformel berechnet. w 3. Es wird auf eine eigentOmliche Intensit~itsvertei]ung in tier Bandenfolge ,J v ~ 0 hingewiesen ; diese l~l~t sich quantenmechanisch verstehen. w 4. In den Banden v' ~ 4 tritt Pr~dissoziation auf. Dies ermSglicht, die Atomterme, in welche die verschiedenen Mo]ekfilzustiinde dissoziieren, anzugeben und die Dissoziationsenergien zu bestimmen~ w 5. Es wird fiber St~rungen eines neuen Typus berichtet; die Linien sind in der Regel nicht verscboben, sondern mehr oder weniger stark geschw~tchL Es wird versucht, einen Tei] dieser StSrungen qualitativ einigermaven zu deuten. w 6. Es wird der Isotopieeffekt gemessen. Wenn man die Masse des normalen Stickstoffatoms a]s 14 annirnrnt, so hat das Isotop ein Atomgewicht, welches ganz nahe bei ] 5 liegt.

High-Resolution Fourier transform spectrometer to identify the rotational structure of the B2.SIGMA.u+-X2.SIGMA.g+ transition of N2+(0,0) in a helium inductively coupled plasma

“…R branches observed in the He-ICP. The accuracy of the (0,0) band data given by Coster and Brons (30) is updated by 0.1-0.2 cm'1.…”

Time Resolved Studies of Perturbations in thev'= 1 Level and Radiative Properties of theC3Πustate in N2

“…The resolution was thus decreased to about 0.2A in order to gain intensity. The pressure dependences of the lifetimes were checked at the (1,4) bandhead in the range 0.5-60 mtorr. The lifetimes were basically independent of the pressure and the measurements on the rotational lines were carried out at p = 50mtorr.…”

“…The lifetimes were basically independent of the pressure and the measurements on the rotational lines were carried out at p = 50mtorr. Lifetimes for the other vibrational levels were carried out at the (O,O), (2,4), (3,1) and (4, 2) bandheads. Also for these levels the lifetimes were independent of pressure, although it was not checked down to 0.5mtorr for vr = 2, 3 or 4 for intensity reasons.…”

The Heat of Dissociation of the Carbon Monoxide Molecule and the Heat of Sublimation of Carbon.

“…For N2 predissociation has been observed in the C3nu and in the P3n" states (16, 20, 7, 40). By the method indicated previously the predissociation in C3n" leads to a reliable value for a dissociation limit at 12.08 volts (16,20,7), whereas from the predissociation in the J38n" state it is only possible to give an upper limit of 9.79 volts for the corresponding dissociation limit. The low-lying states of the nitrogen atom are 4S (ground state), 2D (2.368 volts), 2P(3.553 volts).…”

“…If, therefore, the lines with low intensity at the same time have not their regular position, the drop in intensity has nothing to do with predissociation. But sometimes, e.g., in some N2 bands (7), an intensity drop for a few lines is observed without corresponding frequency shift. This was explained by Ittmann (23) as accidental predissociation, i.e., a perturbation for which the perturbing term is a predissociating term at the same time.…”