Larmor Precession: Observation and Utilization for Boosting the Signal Intensity of Radio Frequency Glow Discharge Mass Spectrometry

Abstract

Bin (2020) Larmor precession: observation and utilization for boosting the signal intensity of radio frequency glow discharge mass spectrometry. Analytical Chemistry, 92 (14). pp. 9528-9535.

Universal N2O Reaction Gas To Remove Spectral Interferences of Nonmetallic Impurity Elements by Inductively Coupled Plasma Tandem Mass Spectrometry Analysis of High-Purity Magnesium Alloys

“…Many types of high-purity Mg alloys with complex matrix compositions are available (see Supporting Information, Table S2). Although the use of hot The high-abundance Si isotope ion 28 Si + with mass-to-charge ratio (m/z) of 28 suffers spectral interferences from 14 N 2 + and 12 C 16 O + . 40 Mg alloys usually contain matrix Al; therefore, the formed 27 AlH + ions also interfere with the determination of 28 Si + .…”

“…When N 2 O is used as the reaction gas, 28 Si + and N 2 O undergo efficient O-atom transfer reaction ( 28 Si + + N 2 O → 28 Si 16 O + + N 2 ). Although 14 N 2 + and 27 AlH + , which cause major interferences with 28 + does not react with N 2 O. Therefore, using 28 Si 16 O 2 + to replace 28 Si + (Q 1 = 28 and Q 2 = 60) can completely eliminate interferences (Figure 2a).…”

“…Glow discharge mass spectrometry (GD-MS) and inductively coupled plasma mass spectrometry (ICP-MS) both have high sensitivity and low limit of detection (LOD), so they are considered as effective methods to analyze trace and ultratrace elements in high-purity alloys. − GD-MS can directly analyze solid samples; therefore, it has been extensively applied for analyzing rod-like or lump-like high-purity metal and alloy materials with multiple dimensions. − However, GD-MS requires solid conductivity calibration standards for analyzing the elements. Compared with liquid sample digests, solid sample as analysis object is more problematic to achieve automation of sample changeover.…”

Focusing Plasma Desorption/Ionization Mass Spectrometry

“…Upon a high voltage (several hundreds to thousands of volts), carrier gases are excited to generate radicals, electrons, and metastable species (termed reagent ions), which interact subsequently with samples by the desorption and ionization of analytes of interest. Based on the type of power supply, plasma-based sources can be divided into four types, namely, direct current (DC) source, ,, alternating current (AC) source, , radio frequency (RF) source, and microwave source . Although AC, RF, and microwave sources are pivotal to ionize different samples, they are operated using extra power supplies, making it impossible to couple directly with commercially available mass spectrometers equipped with a DC source such as ESI or APCI.…”

Improvement in the performance of focusing plasma desorption ionization by altering its counter electrode

“…To date, various versions of plasma-based ionization have been introduced, including DART, 6 atmospheric solids analysis probe (ASAP), 9 desorption atmospheric pressure chemical ionization (DAPCI), 10 low-temperature plasma (LTP), 11 flowing atmospheric pressure afterglow (FAPA), 12 and others. [1][2][3]13 Based on the category of power supply, available techniques can be divided into direct current (DC), 6,9,14 alternating current (AC), 11,15 radio frequency (RF), 16 and microwave 17 sources. Compared to the AC, RF, and microwavebased sources, the techniques operated under DC voltage allow direct tandem with commercially available mass spectrometers without extra power supplies.…”