Recent Spectroscopic Studies of Simple Molecules

1955 ◽  
Vol 59 (2) ◽  
pp. 109-110 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
Spectroscopic Studies ◽  
Simple Molecules

scholarly journals Kinetic and Spectroscopic Studies of Transient Species Prepared by Irmpd

1991 ◽  
Vol 11 (3-4) ◽  
pp. 163-167
Author(s):  
F. Castaño ◽  
A. Ortiz De Zárate ◽  
J. A. Fernández ◽  
M. N. Sánchez Rayo
Keyword(s):  
Removal Rate ◽  
Spectroscopic Studies ◽  
Polyatomic Molecules ◽  
Excess Energy ◽  
Photon Absorption ◽  
Translational Energy ◽  
Transient Species ◽  
Time Resolved ◽  
Simple Molecules ◽  
Electronic Ground

Infrared multiple photon absorption is known to be observed in some triatomic and most polyatomic molecules. When the number of absorbed photons is high enough the process leads to photodissociation and excess energy is released as vibrational, rotational and translational energy in the electronic ground state of the fragments. The contribution of these energies is determined by standard methods, that include laser induced fluorescence, LIF, and time-resolved Fourier transform spectroscopy, TR-FTS. Examples of selected determinations are shown.Once produced, identified and characterized, the kinetic behaviour of the transients with selected reactants can be studied. In particular, removal rate constants of substituted carbenes, in specific vibrational and electronic states, by atoms, olefins and simple molecules are mentioned.

Photochemical Evolution of Interstellar/Precometary Organic Material

1997 ◽  
Vol 161 ◽  
pp. 23-47 ◽  
Author(s):  
Louis J. Allamandola ◽  
Max P. Bernstein ◽  
Scott A. Sandford
Keyword(s):  
Origin Of Life ◽  
Building Blocks ◽  
Complex Species ◽  
Infrared Observations ◽  
Interstellar Ice ◽  
Polycyclic Aromatic ◽  
Ultraviolet Photolysis ◽  
The Origin Of Life ◽  
Simple Molecules ◽  
Complex Organic

AbstractInfrared observations, combined with realistic laboratory simulations, have revolutionized our understanding of interstellar ice and dust, the building blocks of comets. Since comets are thought to be a major source of the volatiles on the primative earth, their organic inventory is of central importance to questions concerning the origin of life. Ices in molecular clouds contain the very simple molecules H2O, CH3OH, CO, CO2, CH4, H2, and probably some NH3and H2CO, as well as more complex species including nitriles, ketones, and esters. The evidence for these, as well as carbonrich materials such as polycyclic aromatic hydrocarbons (PAHs), microdiamonds, and amorphous carbon is briefly reviewed. This is followed by a detailed summary of interstellar/precometary ice photochemical evolution based on laboratory studies of realistic polar ice analogs. Ultraviolet photolysis of these ices produces H2, H2CO, CO2, CO, CH4, HCO, and the moderately complex organic molecules: CH3CH2OH (ethanol), HC(= O)NH2(formamide), CH3C(= O)NH2(acetamide), R-CN (nitriles), and hexamethylenetetramine (HMT, C6H12N4), as well as more complex species including polyoxymethylene and related species (POMs), amides, and ketones. The ready formation of these organic species from simple starting mixtures, the ice chemistry that ensues when these ices are mildly warmed, plus the observation that the more complex refractory photoproducts show lipid-like behavior and readily self organize into droplets upon exposure to liquid water suggest that comets may have played an important role in the origin of life.

Spectroscopic studies of Pd (II) complexes with cysteine and its di- and tripeptides

1987 ◽  
Vol 84 ◽  
pp. 443-448 ◽  
Author(s):  
Teresa Kowalik ◽  
Brigitte Decock-Le Reverend ◽  
Claude Loucheux ◽  
Damien Ficheux ◽  
Henryk Kozlowski
Keyword(s):  
Spectroscopic Studies

MÖSSBAUER SPECTROSCOPIC STUDIES OF DIMENSIONALITY AND SPIN REDUCTION EFFECTS IN THE ANTIFERROMAGNETIC SYSTEMS : (AF)n-FeF3

1980 ◽  
Vol 41 (C1) ◽  
pp. C1-187-C1-188 ◽  
Author(s):  
G. P. Gupta ◽  
J. A. Baines ◽  
D. M. Cooper ◽  
D. P.E. Dickson ◽  
C. E. Johnson
Keyword(s):  
Spectroscopic Studies
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