High accuracy spectrophotometry at the National Physical Laboratory

Machine Translation Research at the National Physical Laboratory, Teddington

The author wishes to point out that the sample given below is no longer representative. Since the article was written, earlier this year, further progress has been made in the implementation of syntactic features in the Laboratory's programmes. The project has, in fact, now reached the stage of evaluation by invited outside specialist readers who send articles for translation and subsequently c...

High Precision Thermal Neutron Detectors at Brookhaven National Laboratory

Standard reference materials: standard quartz cuvettes for high-accuracy spectrophotometry.

Accurate knowledge of lightpath and parallelism of cuvettes used in spectrophotometry are indispensable parameters that must be determined when accurate transmittance measurements of liquid materials are considered. A description is given of the design and techniques developed at NBS for production of quartz cuvettes (SRM 932) having a nominal radiation pathlength of 10 mm ± 0.03 mm. For each c...

Differential NICMOS Spectrophotometry at High S/N

Transiting extrasolar planets present an opportunity for probing atmospheric conditions and constituents by taking advantage of different apparent radii, hence transit depth as a function of wavelength. Strong near-IR bands should support detection of water vapor via G141 spectroscopy of the bright star HD 209458 (H=6.13) by comparing inand out-of-transit ratios of inand out-of-band spectral in...

Ultra-wide bore 900 MHz high-resolution NMR at the National High Magnetic Field Laboratory.

Access to an ultra-wide bore (105 mm) 21.1 T magnet makes possible numerous advances in NMR spectroscopy and MR imaging, as well as novel applications. This magnet was developed, designed, manufactured and tested at the National High Magnetic Field Laboratory and on July 21, 2004 it was energized to 21.1 T. Commercial and unique homebuilt probes, along with a standard commercial NMR console hav...