Valence Orbitals in Simple Molecules and Insulating Solids

1996 ◽  
pp. 146-241
Author(s):  
Stefan Hüfner
Keyword(s):  
Simple Molecules

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.

Cartesian Dynamics of Simple Molecules VII Planar Quadratomics (C2vSymmetry)

1991 ◽  
Vol 24 (6) ◽  
pp. 785-800 ◽  
Author(s):  
S. X. Weng ◽  
A. Anderson
Keyword(s):  
Simple Molecules

Cartesian Dynamics of Simple Molecules IV Centrosymmetric Linear Quadratomics

1990 ◽  
Vol 23 (10) ◽  
pp. 1285-1302 ◽  
Author(s):  
A. Anderson ◽  
J. H. Lefebvre
Keyword(s):  
Simple Molecules

ChemInform Abstract: Photodissociaton of Simple Molecules in the Gas Phase

ChemInform ◽  
2010 ◽  
Vol 32 (47) ◽  
pp. no-no
Author(s):  
Hiroyasu Sato
Keyword(s):  
Gas Phase ◽  
Simple Molecules

Why Do Simple Molecules with “Isolated” Phenyl Rings Emit Visible Light?

2017 ◽  
Vol 139 (45) ◽  
pp. 16264-16272 ◽  
Author(s):  
Haoke Zhang ◽  
Xiaoyan Zheng ◽  
Ni Xie ◽  
Zikai He ◽  
Junkai Liu ◽  
...  
Keyword(s):  
Visible Light ◽  
Phenyl Rings ◽  
Simple Molecules

Ab Initio valence bond treatment of simple molecules

2009 ◽  
Vol 8 (S8) ◽  
pp. 285-291 ◽  
Author(s):  
M. Raimondi ◽  
G. F. Tantardini ◽  
M. Simonetta
Keyword(s):  
Ab Initio ◽  
Valence Bond ◽  
Simple Molecules
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