Publication Date:
2019-06-28
Description:
We describe a recently constructed ground-based mm-wave spectrometer incorporating a superconducting tunnel junction as a heterodyne mixer-receiver. Under conditions of low tropospheric water vapor, the superior sensitivity of this receiver allows spectral line measurements of stratospheric molecules with mixing ratios as small as a few tenths of a part per billion (e.g., ClO, HCN) to be made in 4 to 6 hours, with a signal to noise ratio of at least 30:1. We expect to be able to halve this time by further improvement of the mixer's intrinsic noise level.
Keywords:
INSTRUMENTATION AND PHOTOGRAPHY
Type:
NASA. Goddard Space Flight Center, Ozone in the Troposphere and Stratosphere, Part 2; p 719-722
Format:
application/pdf
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