scholarly journals Negative ion productions in high velocity collision between small carbon clusters and Helium atom target

2012 ◽  
Vol 388 (10) ◽  
pp. 102036
Author(s):  
M Chabot ◽  
K Béroff ◽  
T Pino ◽  
G Féraud ◽  
N Dothi ◽  
...  
Keyword(s):  
Helium Atom ◽  
High Velocity ◽  
Negative Ion ◽  
Carbon Clusters

EVIDENCE FOR THERMIONIC EMISSION FROM SMALL AGGREGATES

1996 ◽  
Vol 03 (01) ◽  
pp. 535-540 ◽  
Author(s):  
C.E. KLOTS ◽  
R.N. COMPTON
Keyword(s):  
Phase Space ◽  
Thermodynamic Properties ◽  
Electric Field ◽  
Experimental Evidence ◽  
Applied Electric Field ◽  
Thermionic Emission ◽  
Negative Ion ◽  
Carbon Clusters ◽  
Neutral Species ◽  
Arbitrary Size

The delayed emission of electrons from small isolated aggregates has been reported now by several laboratories. When the emission is from a negative ion, it can plausibly be identified with the vibrational autoionization which has been known for many years from ions such as [Formula: see text]. Whether delayed emission from neutral species should be called “thermionic” is more problematic. Do these aggregates sample all of the available phase space prior to emission? We examine the experimental evidence which bears on this question. Particular reference is made to studies of “metallic” aggregates and of caged carbon clusters. Tantalizing evidence for the thermionic paradigm is noted, although recent experiments with niobium clusters can only be understood by postulating that they have unusual thermodynamic properties. Finally, Schottky’s expression for the effect of an externally applied electric field on a work function is extended to aggregates of arbitrary size.

scholarly journals The mobility of ions in air. Part II.- Positive ions of short age

1926 ◽  
Vol 110 (754) ◽  
pp. 358-364 ◽  
Keyword(s):  
Water Vapour ◽  
Calcium Chloride ◽  
High Velocity ◽  
Negative Ion ◽  
Positive Ions ◽  
Mobility Of Ions ◽  
Lower Mobility

Until recently far more attention has been given to the problem of the mobility of the negative ion than to that of the positive since the phenomena relating to the latter appeared to be simpler and already well defined. The position has, however, been modified by the interesting discovery by Erikson of the existence of two types of positive ions in a given gas, namely initial ions of short age and final ions of lower mobility formed by their later transformation. Evidence of the existence of these two types has also been obtained since by Wahlin. The method adopted by Erikson involved the use of a blast of gas of high velocity, of the order of 2000 cm. per sec., in order to obtain the shortage necessary. He found that the initial positive ions had a mobility which could not be distinguished from that of negatives, and that in the case of air this held whether he used air saturated with water vapour or air previously dried by passage over calcium chloride.

CORRELATION ENERGIES IN TWO-ELECTRON IONS

2004 ◽  
Vol 18 (05n06) ◽  
pp. 203-206
Author(s):  
DANIEL C. MATTIS ◽  
JIANSHENG WU ◽  
ZIWEN FU
Keyword(s):  
Helium Atom ◽  
Angular Correlation ◽  
Ground State ◽  
Negative Ion ◽  
Positive Ion

We estimate the relative radial and angular correlation energies in the ground state of two-electron ions, such as in the hydrogen negative ion, the helium atom and the lithium positive ion, and find they are roughly equal.

scholarly journals Negative ion formation in small carbon clusters

1993 ◽  
Author(s):  
Howard S. Carman ◽  
Robert N. Compton
Keyword(s):  
Negative Ion ◽  
Carbon Clusters ◽  
Ion Formation
Sign in / Sign up

Export Citation Format

Share Document