Microwave pulse sequence methods for the study of rotational relaxation processes
Abstract
Microwave pulse sequence methods were developed into a tool for accurate measurement of rotational relaxation times at low pressures. Basic models of the collisional coupling of the rotational energy manifold are discussed and the experimental non-idealities explored. Photon echos are observed and discussed. T sub 1 and T sub 2 for the OCS J=01 delta M=0 microwave transition are measured and the evidence found for a non-exponential T sub 1 decay is presented. The measured values are: for radiation from a coherently excited sample, 1/T sub 2 = 37.66 + or - .10 micro-second Torr, and for the population difference between the J=0, M=0, and J=1, M=0, states, 1/T sub 1 = 38.10 + or - 18/micro-second Torr. The construction and optimization of a computer-controlled spectrometer for time resolved microwave measurements are described.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1976
- Bibcode:
- 1976PhDT........98C
- Keywords:
-
- Electromagnetic Pulses;
- Microwaves;
- Molecular Relaxation;
- Low Pressure;
- Particle Collisions;
- Photons;
- Rotation;
- Spectrometers;
- Time Measurement;
- Communications and Radar