Spectrum tungsten lamp

Interference filters with 7-17 nm band width Tungsten lamp [G] [LDi] [L-ns]12 Phototaxigraph (light trap). Rate photoaccumulation. Spectrum is relative response to that at 499 nm corrected for incident quanta Diehn and Tollin29)... 

The equilibrium ground-state spectra of the parent six-coordinate and deoxy five-(or four-)coordinate species were obtained using a Tungsten lamp placed before the I /I beam splitter. Earlier work in our laboratory (3,4) has established that the experimental spectra of transient protoproducts can be resolved as they sequentially evolve during the dissociation process. At relatively long delays > 20 psec after excitation, the spectrum of the stable photoproduct... 

The simplest method of determining the function S, in the visible region of the spectrum is to take photomultiplier readings when the entrance slit of the monochromator is illuminated by a tungsten lamp giving light of known spectral distribution. If RSL represents the values so obtained, the spectral sensitivity is then calculated from... 

Compared to the tungsten lamp, luminescence standards are quite simple to use. The polynomial and associated mathematical manipulations are usually implemented automatically in the spectrometer software (21). The user need only acquire a spectrum of the standard under the same conditions as the sample of interest, usually once per session. After the spectrum [Sl(Au)]... 

Figure 25-4 (a) A tungsten lamp of the type used in spectroscopy and its spectrum (b). Intensity of the tungsten source is usually quite low at wavelengths shorter than about 350 nm. 

The lux meter is used in photometry and is simply a radiometer with a spectral responsiveness that closely matches the visual response of the human eye, thus measuring incident radiant power in the visible region of the electromagnetic spectrum. In this case, the unit of measurement is the illuminance in lux and is calibrated against a specific tungsten lamp. The lux meter should be provided with a set of correction factors to enable compensation for differences in spectral response for lamps with emission spectra different from the calibration lamp. 

At 10 mole % CH3CN in MTHF, the y-irradiated samples showed virtually no difference either in the rate of production or in the total initial intensity of the CH3 radicals generated as a result of changing the wavelength of the bleaching light from the visible (340-600 n.m.) to the red (A > 600 n.m.) end of the spectrum. A 1-kwatt tungsten lamp... 

The photo-annealing of the colored samples by the visible light was effected directly in the resonator of the radiospectrometer during registration of the EPR spectrum. The tungsten lamp, which was provided with the respective light filters, was used as a light source. 

Compounds which absorb ultraviolet or visible light can be quantified for absorption measurements. Absorption measurements can be obtained in either the reflectance or transmission modes. The instrumentation required for these techniques is shown schematically in Figure 3.13. The vast majority of compounds absorb in the ultraviolet or visible region of the spectrum and deuterium and tungsten lamp sources can be used with prisms or gratings, cheaper instrumentation uses band-pass filters for monochromation. 

The emission spectrum of the lamp being used for photosynthetic growth should be considered. H. hcdophila appears to grow better when using tungsten lamps than fluorescent lamps. 

By checking the Reference Correction box the effects of the spectrometer optics can be corrected for. This requires a spectrum of a tungsten lamp for calibration. 

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