منابع مشابه
Detection of SiO emission from a massive dense cold core
We report the detection of the SiO (J = 2−1) transition from the massive cold dense core G333.125−0.562. The core remains undetected at wavelengths shorter than 70 μm and has compact 1.2-mm dust continuum. The SiO emission is localized to the core. The observations are part of a continuing multi-molecular line survey of the giant molecular cloud G333. Other detected molecules in the core includ...
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We have performed maps of the 1.3 mm continuum emission from a sample of 16 evolved stars. We have detected emission from a total of 11 objects, two of which are new detections at this wavelength: M 1-92 and, tentatively, M 1-91. 4 objects in the sample, the bipolar nebulae M 2-9, OH 231.8+4.2, NGC 7027 and CRL 2688, show extended emission in the direction of their symmetry axis up to distances...
متن کاملFew-Cycle THz Emission from Cold Plasma Oscillations
We report on THz emission from plasma oscillations in semiconductors excited by femtosecond optical pulses. Time-resolved correlation measurements are performed on p-i-n and n-doped GaAs structures. In p-i-n structures coherent oscillations of the hot photogenerated carrier plasma emit THz radiation. A fundamentally new emission process is proposed in n-doped GaAs structures. Here, the screenin...
متن کاملEnhanced cold field emission from Š100‹ oriented b–W nanoemitters
Well-aligned b-phase W~100! nanorods having square-base pyramidal apexes were grown on oxidized Si~100! substrate using glancing angle deposition technique with substrate rotation. The field emission characteristics of nanorods were measured using scanning tunneling microscope ~STM! tip as an extraction anode. A highly confined emission current of about 23 mA was obtained at a low extraction vo...
متن کاملDeterministic Cold Cathode Electron Emission from Carbon Nanofibre Arrays
The ability to accurately design carbon nanofibre (CN) field emitters with predictable electron emission characteristics will enable their use as electron sources in various applications such as microwave amplifiers, electron microscopy, parallel beam electron lithography and advanced Xray sources. Here, highly uniform CN arrays of controlled diameter, pitch and length were fabricated using pla...
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ژورنال
عنوان ژورنال: Physical Review
سال: 1931
ISSN: 0031-899X
DOI: 10.1103/physrev.37.582