title: Magnetic resonance properties of some lunar material.
abstract: Paramagnetic resonance spectra of Apollo 11 fines and rocks were measured at 9 and 35 gigahertz and at 4 degrees , 80 degrees , and 300 degrees K. At both frequencies the material has an intense absorption at g = 2, with a line width of approximately 950 gauss. Fe ions with strong exchange interactions produce this resonance. A comparison of the resonance absorption due to Fe(3+) showed that the energy of the crystal field interaction was approximately 0.1 per centimeter. Mn(2+) was identified in several samples, and an absorption at g = 1.89 was tentatively attributed to Ti(3+). The nuclear magnetic resonance spectra of (27)Al had a distribution of asymmetry parameters eta ranging from 0.25 to 0.75 and had nuclear quadrupole coupling constants e(2)qQ/h of approximately 3 megahertz.
authors.forename: R A
authors.initials: RA
authors.lastname: Weeks
authors.forename: A
authors.initials: A
authors.lastname: Chatelain
authors.forename: J L
authors.initials: JL
authors.lastname: Kolopus
authors.forename: D
authors.initials: D
authors.lastname: Kline
authors.forename: J G
authors.initials: JG
authors.lastname: Castle