Hydrogen lamps

Hydrochloric acid vapor reagent 86, 303 Hydrocortisone 221 Hydrogen lamp 21, 22 Hydrogen peroxide 368 -, reagent 307... 

A hydrogen lamp emits blue light at a wavelength of 487 nanometers (nm). What is the frequency in hertz ... 

Fig. 2. Mass spectrometer with photoionization 1—built-in hydrogen lamp 2—vacuum monochromator filled with hydrogen 3—LiF window 4—ionic source container 5—photoionization space with the accelerating grids 6—fluorescent layer for intensity calibration of the incident u.v. light 7—photomultiplier 8—magnetic mass analyzer 9—electron multiplier.

Homonuclear coupling, 143 Horseradish, 337 Hydrogen lamp, 199 Hydrostatic injection, 117 Hyphenated technique, 8 Hypsochromic effect, 195... 

Earlier an experiment was described in which atomic absorption lines were observed using a hydrogen lamp radiation source. Experimentally it can be shown that these absorption line widths are extremely narrow and can only be isolated under conditions of very high spectral resolution. 

These and less important effects which cause line broadening may increase the absorption line to values up to (10 3 nm). Although this is a considerable increase over the natural line width it is still very narrow in practice and very difficult to observe with conventional equipment. Consequently it was not practical to use a continuous radiation source such as a hydrogen lamp. Not only would it be very difficult to isolate the absorption line but the total amount of energy radiated by the light source over such a narrow absorption band would be very small and difficult to measure using conventional detectors. 

Adjust the spectrometer variables of spectral band pass, wavelength and lamp current according to the manufacturer s recommended conditions for Ni and V. It will be necessary to employ background correction for the determination with most electrothermal atomisers, especially in the case of Ni. Where available on the spectrometer, set up the deuterium or hydrogen lamp background correction system as recommended by the manufacturer. Otherwise use a nearby non-absorbing line to estimate the background intensity. 

Check to see if background correction is necessary, especially for elements with resonance wavelengths in the 200—300 nm range, by using a deuterium or hydrogen lamp or a nearby non-absorbing line. 

The Rapid Recording of Absorption Spectra.—If the kinetics of the radical disappearance are to be studied the exposure time must be only a fraction of the radical lifetime which may mean io sec. or less. With continuous sources such as the hydrogen lamp the exposure time required is several seconds at least but three methods of high speed recording are available. 

The study by Gossauer ° was conducted with the unfiltered light of a hydrogen lamp (A = > 1600 A) and at cyclohexane pressures of 0.2 to 1.0 torr. Exactly the same primary processes were postulated to explain the products. The relative contribution of reaction (4) to give propene seems similar to the photolysis of 1470 A, while the reaction to give ethylene, (3), appears to be less important than at 1470 A, in line with the trend observed between 1470 and 1236 A. Gossauer shows that the acetylene formed may arise from secondary photolysis of butadiene. 

Experimental Procedure. As source of ultraviolet light the Author used sparks between zinc electrodes, the hydrogen lamp (which gives a continuous spectrum), or mercury lamps of differing model and power, fed by alternating or by direct current all the mercury lamps emit an arc spectrum. The spectra from these sources were determined by a spectrograph with quartz optics or a diffraction spectrograph with a fluorite window. ... 

The author has used three filters with special advantage WG 7, 8, and 10, for which the transmittances, based on the hydrogen lamp, are indicated in Figure 1. 

With the hydrogen lamp, as radiations pass through only a littl quartz window, the ozone produced was much smaller in quantity and was completely arrested by interposition of the filters WG 7 and WG 8. ... 

Continuum spectrum Radiation consisting of a band of wavelengths as opposed to discrete lines. Incandescent solids provide continuum output (blackbody radiation) in the visible and infrared regions deuterium and hydrogen lamps yield continuum spectra in the ultraviolet region. 

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