Triple‐resonance spectroscopy of the higher excited states of NO2. III. ‖Δv‖>1 autoionization and vibronic coupling

1991 ◽  
Vol 94 (9) ◽  
pp. 5897-5906 ◽  
Author(s):  
Francis X. Campos ◽  
Yanan Jiang ◽  
Edward R. Grant
Keyword(s):  
Excited States ◽  
Vibronic Coupling ◽  
Resonance Spectroscopy ◽  
Triple Resonance ◽  
Higher Excited States

Rotational spectroscopy of vibrationally excited states by infrared-Fourier transform microwave–microwave triple-resonance spectroscopy

2003 ◽  
Vol 376 (5-6) ◽  
pp. 548-556 ◽  
Author(s):  
Kevin O. Douglass ◽  
John C. Keske ◽  
Frances S. Rees ◽  
Kevin Welch ◽  
Hyun S. Yoo ◽  
...  
Keyword(s):  
Fourier Transform ◽  
Excited States ◽  
Resonance Spectroscopy ◽  
Rotational Spectroscopy ◽  
Triple Resonance ◽  
Vibrationally Excited

Evaluation of Luminescence Decay Measurements Probed on Pure and Doped Pt(IV) Hexahalogeno Complexes. II. Molecular Properties Obtained from Temperature Dependent Lifetime Curves

1997 ◽  
Vol 52 (5) ◽  
pp. 447-456
Author(s):  
Ingo Biertümpel ◽  
Hans-Herbert Schmidtke
Keyword(s):  
Excited States ◽  
Ground State ◽  
Energy Levels ◽  
Decay Rates ◽  
Rate Equations ◽  
Temperature Dependent ◽  
Lifetime Measurements ◽  
Thermally Activated ◽  
Ground State Energies ◽  
Higher Excited States

Abstract Lifetime measurements down to nearly liquid helium temperatures are used for determining energy levels and transition rates between excited levels and relaxations into the ground state. Energies are obtained from temperature dependent lifetimes by fitting experimental curves to model functions pertinent for thermally activated processes. Rates are calculated from solutions of rate equations. Similar parameters for pure and doped Pt(IV) hexahalogeno complexes indicate that excited levels largely belong to molecular units. Some of the rates between excited states are only somewhat larger than decay rates into the ground state, which is a consequence of the polyexponential decay measured also at low temperature (2 K). In the series of halogen complexes, the rates between spinorbit levels resulting from 3T1g increase from fluorine to bromine, although energy splittings become larger. Due to the decreasing population of higher excited states in this series, K^PtFö shows a tri-exponential, K2PtCl6 a bi-exponential and FoPtBr6 a mono-exponential decay. In the latter case the population density of higher excited states relaxes so fast that emission occurs primarily from the lowest excited Γ3(3T1g) level. Phase transitions and emission from chromophores on different sites can also be observed.

Photo-CIDNP Studies of 2-Butanone and 3-Pentanone in Solution

1974 ◽  
Vol 52 (16) ◽  
pp. 2978-2984 ◽  
Author(s):  
Shiv P. Vaish ◽  
Robert D. McAlpine ◽  
Michael Cocivera
Keyword(s):  
Electron Spin Resonance ◽  
Carbon Tetrachloride ◽  
Excited States ◽  
Nuclear Polarization ◽  
Radical Reactions ◽  
Electron Spin Resonance Spectroscopy ◽  
Resonance Spectroscopy ◽  
Chemically Induced ◽  
Spin Resonance ◽  
Spin Polarized

The results of photolysis of 2-butanone and 3-pentanone as studied by chemically induced dynamic nuclear polarization (CIDNP) and electron spin resonance spectroscopy (e.s.r.) are reported. In aqueous solutions and t-butanol only the ethyl radical is detected by means of e.s.r., indicating α cleavage to be a major path involving excited states. This observation is further supported by the n.m.r. spectra which are obtained during irradiation of these ketones in D2O and a mixture of CD3CN–D2O (1:1 by volume) containing carbon tetrachloride. Several compounds are detected with their protons spin polarized. A mechanism involving radical reactions is proposed which is consistent with the experimental results.

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