Radical reorientation dynamics studied by positive-muon avoided level crossing resonance

1991 ◽  
Vol 65 (1-4) ◽  
pp. 857-871 ◽  
Author(s):  
Emil Roduner
Keyword(s):  
Positive Muon ◽  
Level Crossing ◽  
Reorientation Dynamics

Surface-adsorbed free radicals observed by positive-muon avoided-level-crossing resonance

Nature ◽  
1990 ◽  
Vol 345 (6273) ◽  
pp. 328-330 ◽  
Author(s):  
Ivan D. Reid ◽  
Toshiyuki Azuma ◽  
Emil Roduner
Keyword(s):  
Free Radicals ◽  
Positive Muon ◽  
Level Crossing

scholarly journals On the Mutual Relationships between Molecular Probe Mobility and Free Volume and Polymer Dynamics in Organic Glass Formers: cis-1,4-poly(isoprene)

Polymers ◽  
2021 ◽  
Vol 13 (2) ◽  
pp. 294
Author(s):  
Helena Švajdlenková ◽  
Ondrej Šauša ◽  
Sergey V. Adichtchev ◽  
Nikolay V. Surovtsev ◽  
Vladimir N. Novikov ◽  
...  
Keyword(s):  
Free Volume ◽  
Spin Probe ◽  
Hyperfine Coupling Constant ◽  
Organic Glass ◽  
Molecular Probe ◽  
Positron Annihilation Lifetime ◽  
Broadband Dielectric Spectroscopy ◽  
Relaxation Modes ◽  
Reorientation Dynamics ◽  
In Cis

We report on the reorientation dynamics of small spin probe 2,2,6,6-tetramethylpiperidinyl-1-oxyl (TEMPO) in cis-1,4-poly(isoprene) (cis-1,4-PIP10k) from electron spin resonance (ESR) and the free volume of cis-1,4-PIP10k from positron annihilation lifetime spectroscopy (PALS) in relation to the high-frequency relaxations of cis-1,4-PIP10k using light scattering (LS) as well as to the slow and fast processes from broadband dielectric spectroscopy (BDS) and neutron scattering (NS). The hyperfine coupling constant, 2Azz′(T), and the correlation times, τc(T), of cis-1,4-PIP10k/TEMPO system as a function of temperature exhibit several regions of the distinct spin probe TEMPO dynamics over a wide temperature range from 100 K up to 350 K. The characteristic ESR temperatures of changes in the spin probe dynamics in cis-1,4-PIP10k/TEMPO system are closely related to the characteristic PALS ones reflecting changes in the free volume expansion from PALS measurement. Finally, the time scales of the slow and fast dynamics of TEMPO in cis-1,4-PIP10k are compared with all of the six known slow and fast relaxation modes from BDS, LS and NS techniques with the aim to discuss the controlling factors of the spin probe reorientation mobility in polymer, oligomer and small molecular organic glass-formers.

Automated Gate control with backup systems at Level Crossing

2020 ◽  
Author(s):  
Narasimha Kulkarni ◽  
Pawan Kumar Doddamani ◽  
Abheejit Chowdhary ◽  
Kavyashree S Kulkarni ◽  
Chaitra Shettar ◽  
...  
Keyword(s):  
Level Crossing ◽  
Gate Control

Seasonal variation in North American level crossing crash rates is due to weather, not day length

2021 ◽  
pp. 1-6
Author(s):  
Steven Henderson ◽  
Anthony Millen ◽  
Christina M. Rudin-Brown
Keyword(s):  
Seasonal Variation ◽  
North American ◽  
Day Length ◽  
Level Crossing ◽  
Crash Rates
Sign in / Sign up

Export Citation Format

Share Document