Photoinitiation of Gas-Phase SN2 Reactions through the Evans−Polanyi Excited State Surface

1997 ◽  
Vol 119 (21) ◽  
pp. 5067-5068 ◽  
Author(s):  
Caroline E. H. Dessent ◽  
Mark A. Johnson
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Sn2 Reactions

Integration of Core-Edge Spectroscopy Methods for the Study of Polymers

1996 ◽  
Vol 54 ◽  
pp. 154-155
Author(s):  
E. G. Rightor
Keyword(s):  
Excited State ◽  
Polymer Blends ◽  
Gas Phase ◽  
Spatial Resolution ◽  
High Spatial Resolution ◽  
Electronic States ◽  
Core Electron ◽  
Bulk Solids ◽  
Development Application

Core edge spectroscopy methods are versatile tools for investigating a wide variety of materials. They can be used to probe the electronic states of materials in bulk solids, on surfaces, or in the gas phase. This family of methods involves promoting an inner shell (core) electron to an excited state and recording either the primary excitation or secondary decay of the excited state. The techniques are complimentary and have different strengths and limitations for studying challenging aspects of materials. The need to identify components in polymers or polymer blends at high spatial resolution has driven development, application, and integration of results from several of these methods.

scholarly journals Investigating the Environment-dependent Photophysics of Chlorine Dioxide With Resonance Raman Intensities

1999 ◽  
Vol 19 (1-4) ◽  
pp. 305-309
Author(s):  
Anthony P. Esposito ◽  
Catherine E. Foster ◽  
Philip J. Reid
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Chlorine Dioxide ◽  
Resonance Raman ◽  
Structural Evolution ◽  
Reaction Dynamics ◽  
Intensity Analysis ◽  
Normal Coordinates ◽  
Raman Intensities ◽  
Asymmetric Stretch

The condensed-phase excited-state reaction dynamics of chlorine dioxide are investigated using resonance Raman intensity analysis. Absolute Raman intensities are measured on resonance with the 2B2–2A2 electronic transition and used to establish the excited-state structural evolution which occurs on the 2A2 surface following photoexcitation. Analysis of the intensities demonstrates that excited-state relaxation occurs along all three normal coordinates; however, only modest evolution is observed along the asymmetric stretch. This limited relaxation stands in contrast to the extensive motion along this coordinate in the gas phase. It is proposed that the initial excited-state structural relaxation serves to define the symmetry of the reaction coordinate and thus the mechanism of Cl production following photolysis of OClO.

Interaction of the C = N Bond with the Cyclopropyl Ring

1981 ◽  
Vol 36 (7) ◽  
pp. 768-773 ◽  
Author(s):  
Shatha F. Al-Siaidi ◽  
Ibrahim T. Ibrahim ◽  
Keyword(s):  
Excited State ◽  
Nitrogen Atom ◽  
Gas Phase ◽  
Bathochromic Shift ◽  
Wave Number ◽  
Phase Spectra

Abstract The conjugative interaction of the C=N bond with the cyclopropylring is studied using UV-spectrophotometric technique. The observed small bathochromic shift in the n-n* bands, relative to the spectra of similar compounds but with no cyclopropylring, is attributed to the interaction of the internal Walsh MO with the nonbonded MO of the Nitrogen atom (Zlint-n interaction) in the bisected conformation of the molecule. The observed bathochromic shifts of the 71-71* bands are explained in terms of the A-n interaction. The gas phase spectra of the azomethine derivatives show vibronic structuring of the band which when analyzed yeld wave number differences be­ tween the successive vibronic peaks, of the magnitude 720—860 cm-1. They are attributed to to the wave number differences between the successive C—N=C deformed ion levels in the excited state. I n te r a c tio n o f th e C = N B o n d w ith th e C y c lo p r o p y l R in g

Excited‐state proton transfer in gas‐phase clusters: 2‐Naphthol⋅(NH3)n

1990 ◽  
Vol 93 (7) ◽  
pp. 4520-4532 ◽  
Author(s):  
Thierry Droz ◽  
Richard Knochenmuss ◽  
Samuel Leutwyler
Keyword(s):  
Excited State ◽  
Proton Transfer ◽  
Gas Phase ◽  
Gas Phase Clusters ◽  
Excited State Proton Transfer

Gas-phase SN2 reactions at silicon and carbon centers. An experimental appraisal of theory

1976 ◽  
Vol 98 (4) ◽  
pp. 894-899 ◽  
Author(s):  
J. D. Payzant ◽  
K. Tanaka ◽  
L. D. Betowski ◽  
D. K. Bohme
Keyword(s):  
Gas Phase ◽  
Carbon Centers ◽  
Sn2 Reactions

scholarly journals Determination of Excited State Molecular Structures from Time-Resolved Gas-Phase X-Ray Scattering

2020 ◽  
Author(s):  
Haiwang Yong ◽  
Andrés Moreno Carrascosa ◽  
Lingyu Ma ◽  
Brian Stankus ◽  
Michael P Minitti ◽  
...  
Keyword(s):  
Excited State ◽  
Gas Phase ◽  
Electronic States ◽  
Molecular Structures ◽  
Excited Electronic States ◽  
Comprehensive Investigation ◽  
Time Resolved ◽  
X Ray ◽  
X Ray Scattering

We present a comprehensive investigation of a recently introduced method to determine transient structures of molecules in excited electronic states with sub-Ångstrom resolution from time-resolved gas-phase scattering signals. The method,...

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