A HIGH RESOLUTION, FAR INFRARED DOUBLE-BEAM LAMELLAR GRATING INTERFEROMETER.
Rept. for 1962-1965,
AEROSPACE CORP EL SEGUNDO CA
Pagination or Media Count:
A high resolution far infrared lamellar grating interferometer which operates in either a single-beam or a double-beam differencing mode of operation is described. The instrument covers a frequency range of 10 to 125cm 1000 to 80micron. To illustrate the general performance of the instrument, the pure rotational spectrum of water vapor between 15 and 115cm is presented. It is estimated that the absorption line centers of strong isolated lines are measured to within or - 0.008cm. To illustrate the resolution of the instrument, low wavenumber portions of the pure rotational spectrum of DC1 are shown. The Cl35 -Cl37 isotope splitting of the J 2 to 3 transition 32.3cm is clearly resolved. The calculated separation of these two lines is 0.904cm. Author
- Test Facilities, Equipment and Methods