Positron annihilation in low-temperature rare gases. I. Helium

1975 ◽  
Vol 12 (2) ◽  
pp. 375-385 ◽  
Author(s):  
K. F. Canter ◽  
J. D. McNutt ◽  
L. O. Roellig
Keyword(s):  
Low Temperature ◽  
Positron Annihilation ◽  
Rare Gases

Positron annihilation in low-temperature rare gases. II. Argon and neon

1975 ◽  
Vol 12 (2) ◽  
pp. 386-395 ◽  
Author(s):  
K. F. Canter ◽  
L. O. Roellig
Keyword(s):  
Low Temperature ◽  
Positron Annihilation ◽  
Rare Gases

Seeking the Good Fitting Procedure of PALS Polymer Spectra

2008 ◽  
Vol 607 ◽  
pp. 64-66
Author(s):  
Nicolas Laforest ◽  
Jérémie De Baerdemaeker ◽  
Corine Bas ◽  
Charles Dauwe
Keyword(s):  
Experimental Data ◽  
Low Temperature ◽  
Positron Annihilation ◽  
Physical Meaning ◽  
Lifetime Measurements ◽  
Positron Annihilation Lifetime ◽  
Fitting Procedure ◽  
Fitting Procedures ◽  
Blob Model

Positron annihilation lifetime measurements on polymethylmethacrylate (PMMA) at low temperature were performed. Different discrete fitting procedures have been used to analyze the experimental data. It shows that the extracted parameters depend strongly on the fitting procedure. The physical meaning of the results is discussed. The blob model seems to give the best annihilation parameters.

On the Limits of Sensitivity of PALS to Incorporated Free Volume Holes in Polymeric Membranes and Sorbents: Effect of sc-CO2 in Polyhexafluoropropylene

2017 ◽  
Vol 373 ◽  
pp. 261-264 ◽  
Author(s):  
Victor Shantarovich ◽  
Valentin Bekeshev ◽  
Nikolai Belov ◽  
Irina Kevdina ◽  
Mikhail Filimonov ◽  
...  
Keyword(s):  
Low Temperature ◽  
Size Distribution ◽  
Positron Annihilation ◽  
Free Volume ◽  
Polymeric Membranes ◽  
Positron Annihilation Lifetime Spectroscopy ◽  
Membrane Materials ◽  
Positron Annihilation Lifetime

Positron annihilation lifetime spectroscopy (PALS) is a recognized instrument for the studies of size-distribution of nanopores (intrinsic free volume holes FVH) in polymers, particularly membrane materials. The limits of this application in the case of “alien” pores, produced by swelling of poly (hexafluoro propylene) PHFP in the gas (CO2) in super-critical (sc-) state are discussed. The obtained conclusions are controlled by measurements of low temperature gas (N2) sorption (LTGS) and by comparison of the data with the results on permeation of various gases through the PHFP membrane. Attention is payed to relaxation with time of the newly created FVH in the PHFP membrane.

Measurement of the activation enthalpy for the recovery of low-temperature deformed indium as determined by positron annihilation

1984 ◽  
Vol 102 (5-6) ◽  
pp. 269-272 ◽  
Author(s):  
I. Lemahieu ◽  
D. Segers ◽  
M. Dorikens ◽  
L. Dorikens-Vanpraet
Keyword(s):  
Low Temperature ◽  
Positron Annihilation ◽  
Activation Enthalpy

Positron annihilation in silica aerogel UV-irradiated at low temperature

2007 ◽  
Vol 4 (10) ◽  
pp. 3793-3795 ◽  
Author(s):  
K. Ro ◽  
F. Saito ◽  
H. Saito ◽  
T. Hyodo
Keyword(s):  
Low Temperature ◽  
Positron Annihilation ◽  
Silica Aerogel

Positron annihilation in pure and doped GaAs at low temperature

1982 ◽  
Vol 88 (8) ◽  
pp. 429-431 ◽  
Author(s):  
D.P. Kerr ◽  
S. Kupca ◽  
B.G. Hogg
Keyword(s):  
Low Temperature ◽  
Positron Annihilation
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