dc.creator Ter Meulen, J. J. en_US dc.creator Dymanus, A. en_US dc.date.accessioned 2006-06-15T13:26:54Z dc.date.available 2006-06-15T13:26:54Z dc.date.issued 1971 en_US dc.identifier 1971-R-9 en_US dc.identifier.uri http://hdl.handle.net/1811/8801 dc.description Author Institution: Department of Physics, University of Nijmegen en_US dc.description.abstract We have constructed a beam-maser spectrometer to study the proposed pumping mechanisms of the population inversion of the low-J A-doublet states of OH. The OH-radicals are produced in the reaction: {H}+{N}{O}_{2}\rightarrow{OH}+{NO} The atomic hydrogen is produced in a high frequency discharge in a mixture of $H_{2}$ and $H_{2}O$. The maser was tested by measuring the main transitions of the $^{2}H_{3/2} J = 9/2 A$ doublet. With superheterodyne detection a signal to noise ratio of 50 is obtained at a time constant of 10 sec. The frequencies of the $F = 5\rightarrow F = 5$ and $F^{\prime} = 4 \rightarrow F^{\prime} = 4$ transitions are 23826621.1 $\pm$ 0.2 kHz and 23817615.3 $\pm$ 0.2 kHz, respectively. The satellite transitions $F = 5 \rightarrow F^{\prime} = 4$ and $F = 4 \rightarrow F^{\prime} = 5$ were broadened by the earth magnetic field but could also be detected. Details of the experiment will be given. en_US dc.format.extent 102089 bytes dc.format.mimetype image/jpeg dc.language.iso English en_US dc.publisher Ohio State University en_US dc.title THE DETECTION OF THE A-DOUBLET TRANSITIONS OF OH IN A BEAM MASER en_US dc.type article en_US
﻿