Kinetics of metastable excited state products in a beam–gas chemiluminescent reaction

Abstract

The kinetics of a beam–gas chemiluminescent experiment are investigated. The first observations of collision induced emission from within an excited molecular electronic state are presented. The importance of a ’’loss mechanism’’ whereby metastable molecules are deactivated in wall collision is discussed. Comparisons with beam–beam chemiluminescent experiments are presented and the role of the excited state radiative lifetime is demonstrated.

Observation of Selectively Populated Monohalide Excited States from the Reactions of Group 3 Metal (Sc, Y, and La) Monomers and Dimers with Halogen-Containing Molecules

“…Transition-metal halides have been of continuing interest in high-temperature chemistry. − Group 3 halides are relevant to lamp technologies , and as model systems for understanding chemical bonding. In addition, the chemiluminescence which has previously been observed , in the reactions between Sc and Y atoms and halogen molecules in several instances appears to indicate selective halide excited electronic state formation. However, controversy , exists as to whether this chemiluminescence is due to electronically excited metal mono- or dihalide molecules.…”

“…The pressure dependence plots were obtained by monitoring the light emission from the reaction zone. Corrections were made to include the slight pressure gradient across the reaction chamber . The metal beam source was situated 6.5 cm from the reaction chamber viewing zone as the vaporized metal beams passed through a 0.6 cm diameter orifice separating the oven and reaction chambers.…”

“…Corrections were made to include the slight pressure gradient across the reaction chamber. 6 The metal beam source was situated 6.5 cm from the reaction chamber viewing zone as the vaporized metal beams passed through a 0.6 cm diameter orifice separating the oven and reaction chambers. A Varian VHS-6 diffusion pump was used to evacuate the reaction chamber and an NHS-6 diffusion pump evacuated the oven chamber.…”

Multiple Chemiluminescent Channels in the Reaction Mn + SF6 → MnF + SF5

“…In group 2, angular scattering measurements find that the Ba reaction proceeds via a long-lived complex, while in Ca*( 3 P, 1 D), Sr*( 3 P) + SF 6 , chemiluminescence has been observed from several metal fluoride electronic states, , and the excitation function of the Ca*( 1 D) → CaF*(A 2 Π) reaction has been determined. , On the other hand, in group 14, the Sn( 3 P) reaction yields chemiluminescence exclusively from SnF 2 *( 3 B 1 ) . Of the d-block metals, only Sc, Y, La + SF 6 appear so far to have been investigated, , to the extent that chemiluminescence has been detected. For Sc and Y, the spectrum is dominated by a “selective feature” whose production is second order in the halogen, implying a secondary process.…”

Μελέτη της ηλεκτρονιακής δομής και των ιδιοτήτων των διατομικών 3d-μεταλλοχλωριδίων MC1 (M=Sc Ti V και Cr) μέσω υπολογισμών πρώτων αρχών

“…διατομικό ScCl συναντάται στα τέλη της δεκαετίας του σε εργασίες των Shenyavskaya και συνεργατών της73,74 στην εργασία των Huber-Herzberg75 και των Gole και συνεργατών του 76. Το 1980 οι υποψήφιοι διδάκτορες Brayman και Fischell μαζί με τον Cool στο πανεπιστήμιο Π→Χ 1 Σ + και Β 1 Π→Χ 1 Σ + του ScCl.…”