Nitrogen excited, from

Diazirine fluorescence provides additional support for RIES.22 Excited di-alkyldiazirines (but not alkylhalodiazirines) fluoresce, and the fluorescence intensity increases with decreasing temperature, suggesting the existence of a barrier to nitrogen loss from the excited diazirine.22 For example, dimethyl-diazirine (35) and 35-df fluoresce upon pulsed laser excitation, with emission due to the excited diazirines. 

A similar conclusion can be drawn from the interaction of metastable nitrogen molecules (the state) with these same surfaces. The relative excitation cross section (the excitation function) for this state is shown in Fig. 36 (see ref. ). Direct excitation by electron impact has a threshold at approximately 6eV and has a maximum at slightly higher energies. De-excitation from the etc. 

As early as 1916, Staudinger and Siegwart predicted that nitrogen extrusion from thermally excited 4,5-diphenyl-l,2,3-thiadiazole would be facile leading to thioketenes (B-61MI42400). Their experiments only led to the isolation of tetraphenylthiophene. 

It can be assumed that the configurations left out in a constrained wavefunction of the type given above will be less important for the dissociation process. This may, however, not be the case close to equilibrium. Obviously a calculation on Li2, which does not include excitations from the bonding a orbitals to the n orbitals, would not be very meaningfuP . A test was performed on the less obvious case of the nitrogen molecule at the experimental geometry. An extended contracted Gaussian AO basis was used (13s, 8p, 3d and 2f contracted to 8s, 5p, 2d and If). First a CASSCF calculation was performed with the active orbitals (see Section III for a motivation of this choice)... 

Very highly excited states can be produced by cavitational collapse caused by ultrasonic irradiation alkanes under argon produce emission from C2H, and CH, whereas under nitrogen, emission from CN predominates. Creed et al. have demonstrated photochemically induced chromophore aggregation in a liquid crystalline poly(arylcinnamate). 

For 77 K fluorescence variations measurements, two leaves were applied against a multibranched optical guide which was then immersed in liquid nitrogen. Excitation light was from a He-Ne laser (632.8 nm, 12 rrti.cm J The fluorescence was measured through a broad (30 nm bandwidth) interference filter at 695 nm using an EMI photomultiplier. 

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