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U.S.N.S. Eltanin Cruises 22-27, January, 1966-February, 1967 : Preliminary Report of Volume 21.
No full text"Technical Report No. 2-CU-2-69, National Science Foundation Grant GA-894.
U.S.N.S. Eltanin Cruises 16-21, January, 1965-January, 1966 : Preliminary Report of Volume 20.
No full text"Technical Report No. 3-CU-3-69, National Science Foundation Grant GA-894.
Quarterly Progress Report No. 1 July-September 1969 on Contract NAS 9-6037
No full textDuring the report period the main effort at Lamont-Doherty Geological Observatory has been to complete preparations for real time data reduction at MSC. Two documents have been submitted to MSC: 1) describing the reduction of ALSEP data in terms of temperatures and temperature differences as a function of time, 2) describing the reduction and interpretation of the conductivity data in real time at MSC.Marcus G. Langseth, Jr. Principal Investigato
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Circulation and exchange at the continental shelf and slope, SEEP-II
Get PDFThis project is a component of the SEEP-2 program to study shelf-slope exchange in the southern Middle Atlantic bight (MBA). It represents the physical oceanographic portion of the SEEP-2 research at Lamont-Doherty Geological Observatory (L-DGO). Since the work consists of two parts: data analysis and theoretical modeling, this report will be divided into two parts to describe the progress of each activity. It covers work performed during the time interval March to December 1990 and is a sequel to the report submitted in February 1990. 25 figs
The Lamont—Doherty Geological Observatory Isolab 54 isotope ratio mass spectrometer
No full textThe Lamont—Doherty Geological Observatory (LDGO) Isolab 54 is a double focussing isotope ratio mass spectrometer that allows the measurement of thermal ions produced on a hot filament, (thermal-ionization mass spectrometry (TIMS)), secondary ions produced by sputtering a sample using a primary ion beam, (secondary ion mass spectrometry (SIMS)), and sputtered neutrals resonantly ionized using laser radiation, (sputter-induced resonance ionization mass spectrometry (SIRIMS)). Sputtering is carried out using an Ar primary beam generated in a duoplasmatron and focussed onto the sample using a two-lens column. Resonance ionization is accomplished using a frequency-doubled dye laser pumped by an excimer laser.
The Isolab's forward geometry analyzer, consisting of an electrostatic followed by a magnetic sector, allows the simultaneous collection of different isotopes of the same element. This instrument is the first to have a multicollector that contains an ion-counting system based on a microchannel plate as well as traditional Faraday cups. A second electrostatic sector after the multicollector is equipped with an ion-counting Daly detector to allow high abundance sensitivity for measurements of large dynamics range. Selectable source, collector, α and energy slits on the instrument allow analyses to be made over a range of mass resolving powers and analyzer acceptances.
Recent applications of the instrument have included the analyses of U by TIMS, Hf, Th and Re by SIMS and Re and Os by SIRIMS
The Lamont—Doherty Geological Observatory Isolab 54 isotope ratio mass spectrometer
No full textThe Lamont—Doherty Geological Observatory (LDGO) Isolab 54 is a double focussing isotope ratio mass spectrometer that allows the measurement of thermal ions produced on a hot filament, (thermal-ionization mass spectrometry (TIMS)), secondary ions produced by sputtering a sample using a primary ion beam, (secondary ion mass spectrometry (SIMS)), and sputtered neutrals resonantly ionized using laser radiation, (sputter-induced resonance ionization mass spectrometry (SIRIMS)). Sputtering is carried out using an Ar primary beam generated in a duoplasmatron and focussed onto the sample using a two-lens column. Resonance ionization is accomplished using a frequency-doubled dye laser pumped by an excimer laser. The Isolab's forward geometry analyzer, consisting of an electrostatic followed by a magnetic sector, allows the simultaneous collection of different isotopes of the same element. This instrument is the first to have a multicollector that contains an ion-counting system based on a microchannel plate as well as traditional Faraday cups. A second electrostatic sector after the multicollector is equipped with an ion-counting Daly detector to allow high abundance sensitivity for measurements of large dynamics range. Selectable source, collector, α and energy slits on the instrument allow analyses to be made over a range of mass resolving powers and analyzer acceptances. Recent applications of the instrument have included the analyses of U by TIMS, Hf, Th and Re by SIMS and Re and Os by SIRIMS
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