Origin of Pyrene under High Temperature Conditions in the Gas Phase. The Pivotal Role of Phenanthrene

1999 ◽  
Vol 64 (11) ◽  
pp. 3861-3866 ◽  
Author(s):  
Martin Sarobe ◽  
Leonardus W. Jenneskens ◽  
Ralph G. B. Steggink ◽  
Tom Visser
Keyword(s):  
High Temperature ◽  
Gas Phase ◽  
Pivotal Role ◽  
Temperature Conditions

ChemInform Abstract: Origin of Pyrene under High Temperature Conditions in the Gas Phase. The Pivotal Role of Phenanthrene

ChemInform ◽  
2010 ◽  
Vol 30 (33) ◽  
pp. no-no
Author(s):  
Martin Sarobe ◽  
Leonardus W. Jenneskens ◽  
Ralph G. B. Steggink ◽  
Tom Visser
Keyword(s):  
High Temperature ◽  
Gas Phase ◽  
Pivotal Role ◽  
Temperature Conditions

scholarly journals Gas phase formation of phenalene via 10π-aromatic, resonantly stabilized free radical intermediates

2020 ◽  
Vol 22 (27) ◽  
pp. 15381-15388
Author(s):  
Long Zhao ◽  
Ralf I. Kaiser ◽  
Wenchao Lu ◽  
Musahid Ahmed ◽  
Artem D. Oleinikov ◽  
...  
Keyword(s):  
High Temperature ◽  
Free Radical ◽  
Gas Phase ◽  
Phase Formation ◽  
Radical Intermediates ◽  
Temperature Conditions ◽  
Combustion Systems ◽  
Circumstellar Environments

1H-Phenalene can be synthesized via the reaction of the 1-naphthyl radical with methylacetylene and allene under high temperature conditions prevalent in carbon-rich circumstellar environments and combustion systems.

The Role of Gas Phase Decomposition in the ALE Growth of III–V Compounds

1991 ◽  
Vol 222 ◽  
Author(s):  
K. G. Reid ◽  
H. M. Urdianyk ◽  
N. A. El-Masry ◽  
S. M. Bedair
Keyword(s):  
Boundary Layer ◽  
High Temperature ◽  
Gas Phase ◽  
Exposure Time ◽  
Growth Temperature ◽  
Phase Decomposition ◽  
Temperature Growth ◽  
Mocvd Reactor ◽  
Maximum Exposure

ABSTRACTThe effects of the growth temperature and exposure time to TMGa for ALE of gallium arsenide was studied using TMGa and AsH3 in a modified, vertical, atmospheric, MOCVD reactor with a rotating susceptor. It was found that the temperature range for ALE growth could -be extended from 450°C to 700°C by adjustment of the exposure time to TMGa. The maximum exposure time to TMGa was found to decrease as growth temperature increased with high temperature growth limited to exposures of only fractions of a second. Beyond a critical exposure time to TMGa, gallium droplets form on the surface. It is known that premature decomposition of TMGa in the heated gaseous boundary layer causes the formation of the gallium droplets and the consequent loss of ALE growth.

Modulating the H-bond strength by varying the temperature for the high pressure synthesis of nitrogen rich carbon nanothreads

Nanoscale ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 5233-5242 ◽  
Author(s):  
Samuele Fanetti ◽  
Mario Santoro ◽  
Frederico Alabarse ◽  
Berretti Enrico ◽  
Roberto Bini
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Bond Strength ◽  
Kinetic Control ◽  
High Pressure Synthesis ◽  
Temperature Conditions ◽  
Pressure Synthesis

Synthesis of carbon nanothreads from pyridine under variable high-pressure and high-temperature conditions discloses the role of H-bonding in the kinetic control of the reaction.

THE ROLE OF PRECURSOR STATES IN CATALYSIS

1994 ◽  
Vol 01 (04) ◽  
pp. 549-551 ◽  
Author(s):  
MICHAEL BOWKER
Keyword(s):  
Gas Phase ◽  
Cross Section ◽  
Catalytic Reactions ◽  
Pivotal Role ◽  
Adsorbed Species ◽  
Reaction Event ◽  
Precursor States

It is proposed that weakly held precursor states of catalytically significant molecules can play a pivotal role in some types of catalytic reactions. The concept of the 'diffusion circle' is introduced which is experimentally manifested as a much higher cross-section for reaction between an incoming molecule from the gas phase and an adsorbed species than would be expected. This can yield kinetics which are of the Rideal-Eley type, although the reaction event itself is more properly described as Langmuir-Hinshelwood.

scholarly journals Differentiating induced versus spontaneous subduction initiation using thermomechanical models and metamorphic soles

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xin Zhou ◽  
Ikuko Wada
Keyword(s):  
High Temperature ◽  
Plate Tectonics ◽  
Numerical Models ◽  
Critical Role ◽  
Slab Surface ◽  
Subduction Initiation ◽  
Temperature Conditions ◽  
Wide Range ◽  
Parameter Values

AbstractDespite the critical role of subduction in plate tectonics, the dynamics of its initiation remains unclear. High-temperature low-pressure metamorphic soles are vestiges of subduction initiation, providing records of the pressure and temperature conditions along the subducting slab surface during subduction initiation that can possibly differentiate the two end-member subduction initiation modes: spontaneous and induced. Here, using numerical models, we show that the slab surface temperature reaches 800–900 °C at ~1 GPa over a wide range of parameter values for spontaneous subduction initiation whereas for induced subduction initiation, such conditions can be reached only if the age of the overriding plate is <5 Ma. These modeling results indicate that spontaneous subduction initiation would be more favorable for creating high-temperature conditions. However, the synthesis of our modeling results and geological observations indicate that the majority of the metamorphic soles likely formed during induced subduction initiation that involved a young overriding plate.

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