scholarly journals Recent measurements of electrical conductivity and ion pair production rate, and the ion-ion recombination coefficient derived from them in the lower stratosphere.

1983 ◽  
Vol 35 (2) ◽  
pp. 29-38 ◽  
Author(s):  
Yasuhiro MORITA
Keyword(s):  
Electrical Conductivity ◽  
Pair Production ◽  
Production Rate ◽  
Lower Stratosphere ◽  
Ion Pair ◽  
Recombination Coefficient ◽  
Ion Recombination

scholarly journals Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation submodel (NAN) includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric chemistry - Climate (EMAC) model. The Ion pair production rate, needed to calculate the ion-induced or -mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground based observations.

scholarly journals Two new submodels for the Modular Earth Submodel System (MESSy): New Aerosol Nucleation (NAN) and small ions (IONS) version 1.0

2018 ◽  
Vol 11 (12) ◽  
pp. 4987-5001
Author(s):  
Sebastian Ehrhart ◽  
Eimear M. Dunne ◽  
Hanna E. Manninen ◽  
Tuomo Nieminen ◽  
Jos Lelieveld ◽  
...  
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Aerosol Particle ◽  
Atmospheric Chemistry ◽  
Particle Formation ◽  
Ion Pair ◽  
New Particle Formation ◽  
Production Rates ◽  
Organic Species ◽  
Good Agreement

Abstract. Two new submodels for the Modular Earth Submodel System (MESSy) were developed. The New Aerosol Nucleation (NAN) submodel includes new parameterisations of aerosol particle formation rates published in recent years. These parameterisations include ion-induced nucleation and nucleation of pure organic species. NAN calculates the rate of new particle formation based on the aforementioned parameterisations for aerosol submodels in the ECHAM/MESSy Atmospheric Chemistry (EMAC) model. The ion pair production rate, needed to calculate the ion-induced or ion-mediated nucleation, is described using the new submodel IONS, which provides ion pair production rates for other submodels within the MESSy framework. Both new submodels were tested in EMAC simulations. These simulations showed good agreement with ground-based observations.

scholarly journals Electrical Conductivity of the Stratosphere

2013 ◽  
Vol 12 (1) ◽  
pp. 39-47
Author(s):  
Kamsali Nagaraja ◽  
S D Pawar ◽  
P Murugavel ◽  
V Gopalakrishnan
Keyword(s):  
Electrical Conductivity ◽  
Ionic Conductivity ◽  
Ion Conductivity ◽  
Recombination Coefficient ◽  
Experimental Measurements ◽  
Aerosol Model ◽  
Aerosol Loading ◽  
Electrical State ◽  
Ion Recombination

Ionic conductivity of the stratosphere is one of the important parameters for understanding the electrical state of the region. This parameter is sensitive to the presence of aerosols and thus, aerosol loading on the stratosphere has a bearing on the conductivity. Preliminary efforts were made to study the behaviour of stratospheric ion conductivity and its variation under enhanced aerosol conditions by making use of an Ion-aerosol model. The aerosol ion-small ion recombination coefficient obtained from the model determines the extent to which aerosols can alter the conductivity of the stratosphere. This necessitates the requirement of experimental measurements of attachment and recombination coefficient along with simultaneously measured aerosol density to have the proper information on electrical conductivity of the region.

scholarly journals Holographic Schwinger effect with a deformed AdS background

2017 ◽  
Vol 32 (10) ◽  
pp. 1750045 ◽  
Author(s):  
J. Sadeghi ◽  
B. Pourhassan ◽  
S. Tahery ◽  
F. Razavi
Keyword(s):  
Pair Production ◽  
Production Rate ◽  
Electrostatic Potential ◽  
Deformation Parameter ◽  
Zero Temperature ◽  
Test Particles ◽  
Schwinger Effect

In this paper, we consider a deformed AdS background and study the effect of deformation parameter on the pair production rate of the Schwinger effect. The electrostatic potential is important for the pair production in the holographic Schwinger effect. In this paper, we analyze the electrostatic potential in a deformed AdS background and investigate the effect of deformation parameter which may be useful to test the AdS/QCD. In the case of zero temperature, we find that the larger value of the deformation parameter leads to a smaller value of separation length of the test particles on the probe. Also, we find a finite maximum of separation length in the presence of modification parameter.

Threshold ion-pair production spectroscopy (TIPPS) of H2 and D2

2000 ◽  
Vol 115 ◽  
pp. 331-343 ◽  
Author(s):  
Ralph. C. Shiell ◽  
Xiaokun Hu ◽  
ichi. J. Hu ◽  
John W. Hepburn
Keyword(s):  
Pair Production ◽  
Ion Pair

Ion neutralization reactions in irradiated hydrogen chloride, hydrogen bromide, and nitrous oxide

1970 ◽  
Vol 48 (4) ◽  
pp. 598-602 ◽  
Author(s):  
D. E. Wilson ◽  
D. A. Armstrong
Keyword(s):  
Nitrous Oxide ◽  
Hydrogen Chloride ◽  
Hydrogen Bromide ◽  
Recombination Coefficient ◽  
X Rays ◽  
Ion Density ◽  
Ion Recombination ◽  
Three Body

Rates of ion neutralization have been measured in hydrogen chloride, hydrogen bromide, and nitrous oxide by collecting the ions remaining in a defined volume at various times after ionization by a pulse of 120 k.v.p. X-rays. Values of the total homogeneous ion-ion recombination coefficient, a, have been obtained for each gas over a range of pressures in the region 50 to 650 Torr. From a study of the effects of pressure and ion density, the relative rates of wall diffusion, mutual neutralization, and three-body neutralization have been deduced.

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