Abstract
We have measured the temperature dependence of the dynamic proton polarization in a 0.2-g sample of 95% 1-butanol and 5% water, containing 0.75% of the free radical porphyrexide, between 1.4 and 0.5 K. The largest polarization attained was 67% at 0.5 K. The feasibility of achieving comparable polarization in larger samples and the question of the origin of the observed temperature dependence are discussed.
Original language | English (US) |
---|---|
Pages (from-to) | 460-462 |
Number of pages | 3 |
Journal | Physical review letters |
Volume | 23 |
Issue number | 9 |
DOIs | |
State | Published - 1969 |
ASJC Scopus subject areas
- General Physics and Astronomy