Noise power spectral characteristics of an inductively coupled plasma-mass spectrometer

Abstract

The noise power spectra of 85Rb+ signal and MNb+ signal from an Inductively coupled plasma mass spectrometer were measured at the same plasma conditions as were those of Sr II emission from the plasma Itself. Comparison of these spectra showed that discrete frequency noise In the emission at the mass spectrometer sampling orifice Is nearly Identical with that In the mass spectrometrlc signal and that white noise In the mass spectrometer signal was higher than that found In the emission signal. The dependence of noise frequencies on plasma operating conditions was generally the same for both measurements and was generally the same as that expected of emission from the plasma alone, l.e., when the plasma was not being sampled for mass spectrometry. However, discrete frequency noise In emission from the plasma alone differed substantially In frequency from that in the mass spectrometrlc signal. These results Indicate that the plasma Is the source of discrete frequency noise In the mass spectrometrlc signal and that the discrete noise frequencies can be affected by changes In plasma gas dynamics due to interaction between the plasma and the mass spectrometer sampling Interface. The major source of signal Instability In this particular Inductively coupled plasma mass spectrometer was found to be 1H noise.

Input ion optics of inductively coupled plasma quadrupole mass spectrometers. Part 3. Asymmetrical systems with local arc-shaped ion deflection

“…Полученный ги-бридный двухцелевой инструмент получил назва-ние POEMS (Plasma Optical Emission and Mass Spectrometer) [20][21][22]. Идея его создания опиралась, в частности, на выполненные ранее соответствую-щие эксперименты [23,24]. При создании этого ги-брида исходили, по-видимому, из того, что POEMS, предоставляющий возможности двух методов в од-ном приборе, стоил дешевле, чем комплект из двух отдельных ИСП-МС и ИСП-АЭС спектрометров.…”

Plasma-source mass spectrometry for speciation analysis: state-of-the-art

“…The source of much of this variance comes from multiplicative phenomena; it affects all signals in the same manner, and by an amount proportional to the signal amplitude. In particular, the ICP is known to suffer from a source of correlated noise known as whistle noise, which typically occurs in the audible range, as well as flicker (1/f) and white noise [24][25][26][27].…”

Inductively Coupled Plasma Mass Spectrometry with an Electrically Floating Sampling Interface

“…A schematic of the ICP /MS instrument used in this work is shown in Figure 1. This instrument and some components have been described in detail elsewhere [19][20][21]. Operating conditions are identified in Table 1.…”