A New Spectroscopic Source Unit*

Excitation of Spectra of Multiply Ionized Atoms by Capacitor Discharges

“…In 1943 Hasler and Dietert 1 developed the idea -3- LBL-1975 that by separating the charge and discharge cycles of the capacitor making each independently controllable, breakdown of the gap can be achieved with a low-power high voltage ignitor circuit and a low-voltage high power capacitor discharged through the gap once it has broken down. Several advantages over the previous sparks are: (1) the amount of energy discharge in each cycle is I more reproducible, (2) higher capacitances (-10 ~f) can be used with the lower voltages (-1 kV) for a given amount of energy, allowing variation from underdamped through critically damped and overdamped discharges, (3) termination of the discharge depends only on the circuit and gap constants, it is no longer affected by the synchronous rotating gap and (4) lower voltages reduces the broadening and shifting of atomic spectral lines caused by the Stark effect which is particularly important for radiation involving levels with large azimuthal quantum number. In 1950 Vodar and Astoin 2 suggested introducing an insulating surface between the electrodes to facilitate breakdown of the gapthe sliding spark.…”

Spectrochemical Determination of Magnesium, Iron, Silicon, and Manganese in Titanium Metal

“…Power, Multisource (6) with variable settings for the various determinations as discussed below. Polarity of the sample is positive.…”

“…The Jamieson method (3) for the quantitative determination of hydrazino-nitrogen utilizes the visual disappearance of the iodine color from chloroform in an aqueous solution containing a high concentration of hydrochloric acid. This procedure has been shown to be applicable to aminoguanidine salts, benzal aminoguanidine (I), semicarbazide hydrochloride, some semicarbazones (7), carbohydrazide (4), and nitroaminoguanidine (6). Smith and Wheat (7) also found that the method was successful with p-bromophenylhydrazine but that anomalous results were obtained with furfural semicarbazone, thiosemicarbazide, and the phenylosazones of dextrose and lactose.…”

Analysis of Silica-Alumina Cracking Catalysts

“…The ARL-Dietert Multisource unit (1,3) was used to excite the spectra. The input voltage to this unit was held at 230 ± 4 volts by a General Electric AIRS type constant-voltage transformer.…”