Joint action of an inert diluent and electric field on gas-phase flames

1988 ◽  
Vol 24 (6) ◽  
pp. 700-702 ◽  
Author(s):  
G. A. Gulyaev ◽  
G. A. Popkov ◽  
Yu. N. Shebeko ◽  
A. P. Korolenok
Keyword(s):  
Electric Field ◽  
Gas Phase ◽  
Joint Action ◽  
Inert Diluent

Synergism effects in combined action of electric field and inert diluent on gas-phase flames

1987 ◽  
Vol 23 (2) ◽  
pp. 170-172 ◽  
Author(s):  
G. A. Gulyaev ◽  
G. A. Popkov ◽  
Yu. N. Shebeko
Keyword(s):  
Electric Field ◽  
Gas Phase ◽  
Inert Diluent ◽  
Combined Action

STUDIES OF ELECTRONIC PROPERTIES OF MEDIUM AND LARGE MOLECULES ORIENTED IN A STRONG UNIFORM ELECTRIC FIELD

2001 ◽  
Vol 15 (27) ◽  
pp. 3471-3502 ◽  
Author(s):  
WEI KONG
Keyword(s):  
Electric Field ◽  
Small Molecules ◽  
Gas Phase ◽  
Variation Method ◽  
Detailed Knowledge ◽  
Translational Energy ◽  
Spectroscopic Techniques ◽  
Transition Dipole ◽  
Polarization Spectroscopy ◽  
Large Molecules

Polarization spectroscopy of oriented gas phase medium and large molecules achieved via a uniform DC electric field provides a means to determine the direction of transition dipoles. In this article, the theoretical background of this orientation method, its characterization, and its application in studies of electronic transitions, will be presented. Mature gas phase spectroscopic methods have been developed for studies of small molecules, but studies of medium to large sized species are faced with special challenges. These challenges arise from differences between large and small molecules: large systems typically exhibit fast internal conversion, slow dissociation, and low translational energy release upon dissociation. Thus conventional gas phase spectroscopic techniques are not applicable to derive the direction of the transition dipole. DC induced orientation offers a solution to this problem. It is ideal for studies of systems with small rotational constants and large permanent dipoles, even when a detailed knowledge of the molecular structure, such as the direction of the permanent dipole in the molecular frame, is unknown. The degree of orientation can be calculated using the linear variation method, given the rotational temperature and the size of the permanent dipole. The associated experimental observables can be used to confirm the effect of orientation, or to determine the direction of a transition dipole. These observables include the ratio of excitation probabilities under different polarization directions and spectroscopic features. In some cases, the direction and size of the permanent dipole of the excited electronic state can also be determined. Examples of this type of polarization spectroscopy are presented for asymmetric tops such as diazines, acetelye-HF clusters, nitroaromatics and butyl nitrite. Illustrations of pendular states and its application in linear and diatomic molecules are also briefed. Applications of this method for studies of large molecules and potential pitfalls will be discussed.

The Effect of Electric Fields on the Radiolysis of Acetylene, and the Mechanism of Cuprene Formation

1971 ◽  
Vol 49 (23) ◽  
pp. 3789-3794 ◽  
Author(s):  
J. P. Briggs ◽  
R. A. Back
Keyword(s):  
Electron Microscope ◽  
Electric Field ◽  
Gas Phase ◽  
Electric Fields ◽  
Reaction Vessel ◽  
Liquid Droplets ◽  
Pressure Decrease ◽  
Γ Rays

Gaseous acetylene at pressures of about 200 Torr was irradiated with γ-rays at doserates between about 1011 and 1012 eV/cc s, with and without an electric field applied. The deposition of cuprene on the bottom of the reaction vessel was markedly affected by the field, but the rate of cuprene formation as measured by the pressure decrease was unchanged. Examination of the cuprene deposit with an electron microscope showed it to consist of rather uniform spheres averaging about 3000 Å in diameter, with each containing an estimated 2 × 108 molecules of acetylene. The mechanism of cuprene formation is discussed, and it is suggested that it does not proceed through a direct polymerization of acetylene, but involves a secondary polymerization of polyene intermediates, in the gas phase and after their condensation in liquid droplets.

Sign in / Sign up

Export Citation Format

Share Document