Showing papers by "Thomas G. Phillips published in 1979"
TL;DR: In this article, a small area (≲1 μm2) oxide-barrier tunnel junctions have been made of thermally cyclable superconducting Pb alloys for use as high frequency mixers.
Abstract: Small‐area (≲1 μm2) oxide‐barrier tunnel junctions have been made of thermally cyclable superconducting Pb alloys for use as high‐frequency mixers. A single‐sideband mixer noise temperature of <100 K has been achieved at 115 GHz. This result was achieved in the quasiparticle (classical) mixing mode.
124 citations
TL;DR: In this paper, spectra and strip maps of CO(J=2-1) emission for a variety of molecular clouds within the Galaxy are presented, and a discussion of the behavior of line widths and spatial extents as a function of CO line opacity is given.
Abstract: We present spectra and strip maps of CO(J=2-1) emission for a variety of molecular clouds within the Galaxy. In most cases data are also presented for the less-abundant species /sup 13/CO and C/sup 18/O, and, where possible, cpmparison is made between the CO(2-1) data and equivalent CO(1-0) spectra and maps. A discussion is given of the behavior of line widths and spatial extents as a function of CO line opacity. From the line widths it is deduced that for some dense molecular clouds the CO(1-0) optical depth is in the range 20--100.
75 citations
TL;DR: In this paper, three millimeter-wavelength transitions of ClO were searched for in the stratospheric emission spectrum during May-August 1977 using aircraft-based instruments, and the results indicated that if the ClO volume mixing ratio at the profile peak did not exceed 10 to the -9th at the time and place of the measurements.
Abstract: Three millimeter-wavelength transitions of ClO were searched for in the stratospheric emission spectrum during May-August 1977 using aircraft-based instruments. The measurements indicate that if stratospheric ClO has a vertical distribution of the form predicted by present photochemical models, then the ClO volume mixing ratio at the profile peak did not exceed 10 to the -9th at the time and place of the measurements. The observed spectra suggest the presence of ClO in the stratosphere but do not provide a definitive detection.
47 citations
Journal Article•
20 citations
17 citations
Journal Article•
TL;DR: The HCN observations suggest molecular hydrogen densities ~ 10^6 cm^(-3) in the broad wing source, and the differences between the lines of HCN and HCO^+ suggest that the lines may be formed in different regions within the source.
Abstract: We report the first measurements of the 11 mm (J = 3-2) lines of HCN, HNC, and HCO^+ in the Orion molecular cloud The low-intensity broad velocity wings seen in the (1-0) lines of HCN and HCO^+ are greatly enhanced in the HCN (3-2) line but not in HCO^+ (3-2) No broad wings are seen in the HNC (3-2) line The HCN observations suggest molecular hydrogen densities ~ 10^6 cm^(-3) in the broad wing source, and the differences between the lines of HCN and HCO^+ suggest that the lines may be formed in different regions within the source
16 citations
TL;DR: In this paper, the first measurements of the 1.1 mm (J = 3-2) lines of HCN, HNC, and HCO^+ in the Orion molecular cloud were reported.
Abstract: We report the first measurements of the 1.1 mm (J = 3-2) lines of HCN, HNC, and HCO^+ in the Orion molecular cloud. The low-intensity broad velocity wings seen in the (1-0) lines of HCN and HCO^+ are greatly enhanced in the HCN (3-2) line but not in HCO^+ (3-2). No broad wings are seen in the HNC (3-2) line. The HCN observations suggest molecular hydrogen densities ~ 10^6 cm^(-3) in the broad wing source, and the differences between the lines of HCN and HCO^+ suggest that the lines may be formed in different regions within the source.
11 citations
Journal Article•
3 citations