Time-of- flight mass spectrometer
A time-of-flight mass spectrometer for high energy (0.5 - 1.0 keV) electron ionization of gases.
... obtendo-se desta forma, a cada pulso, uma base temporal para a medida dos tempos de vôo, com o emprego de um Conversor Tempo-Amplitude (Time to Amplitude Converter - TAC). Em outras palavras, a geração do pulso de ...
5
Analysis of cloud condensation nuclei composition and growth kinetics using a pumped counterflow virtual impactor and aerosol mass spectrometer
... Aerodyne time-of-flight aerosol mass spectrometer (C-ToF-AMS) has previously been described in detail (Drewnick et ...purpose of focusing the particles into a narrow beam and ...
12
J. Braz. Chem. Soc. vol.23 número1
... tandem mass spectrometry performed in a hybrid quadrupole time-of-flight mass spectrometer were used to investigate the dissociation chemistry of the intact molecules ...
8
Rapid "breath-print" of liver cirrhosis by proton transfer reaction time-of-flight mass spectrometry. A pilot study.
... Real time breath analysis was performed using a buffered end- tidal (BET) on-line sampler [15] coupled to a Proton Transfer Reaction Time-of-Flight Mass Spectrometer (PTR-ToF-MS, ...
9
Real-time monitoring of trace-level VOCs by an ultrasensitive lamp-based VUV photoionization mass spectrometer
... development of a lamp-based vacuum ultraviolet photoionization mass spec- trometer (VUV-PIMS) in our laboratory; it is composed of a radio-frequency-powered VUV lamp, a VUV photoion- izer, an ...
7
Airborne observations of formic acid using a chemical ionization mass spectrometer
... the flight was measured from the London ...volume of industrial, domestic and transport activity, a known ma- jor source of carboxylic acid emissions (Chebbi and Carlier, ...volume of traffic ...
11
Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry for Differentiation of the Dimorphic Fungal Species Paracoccidioides brasiliensis and Paracoccidioides lutzii
... total of 22 strains representing the two species previously iden- tified by molecular techniques, including multilocus sequence typ- ing, PCR of the hsp70 gene, and internal transcribed space (ITS) rRNA ...
4
A switchable reagent ion high resolution time-of-flight chemical ionization mass spectrometer for real-time measurement of gas phase oxidized species: characterization from the 2013 Southern Oxidant and Aerosol Study
... compounds) outgassing from the tubing. Titration of the reagent ion makes calibra- tion impossible. Instead, we introduce calibration gases into the reduced pressure inlet by interfacing a normally closed solenoid ...
46
Mould routine identification in the clinical laboratory by matrix-assisted laser desorption ionization time-of-flight mass spectrometry.
... that of conventional methods in the routine clinical laboratory setting ...types of matrix, and instruments were also ...because mass spectra are influenced by culture conditions, extraction ...
9
Novel experimental setup for time-of-flight mass spectrometry ion detection in collisions of anionic species with neutral gas-phase molecular targets
... field of −600 V, 0-8 μs variable width, 80 ms duty-cycle and 1500 μs delayed from the anionic pulse beam, is applied between two parallel plates (BR1 in ...distance of 15 ...plane of the two crossing ...
8
Atmospheric aerosol compositions and sources at two national background sites in northern and southern China
... currence of primary marine organic aerosol plumes on the west coast of ...picture of an- thropogenic emissions in hot polluted ...lation of more than 1 billion and is characterized by high air ...
15
Aqueous-phase photooxidation of levoglucosan – a mechanistic study using aerosol time-of-flight chemical ionization mass spectrometry (Aerosol ToF-CIMS)
... first time referred this sys- tem as an Aerosol ...strength of Aerosol CIMS lies in the fast time re- sponse, enabling in situ monitoring of aqueous-phase chem- ...high mass resolution ...
12
Detection of SPM-1-Producing Pseudomonas aeruginosa and Class D beta-Lactamase-Producing Acinetobacter baumannii Isolates by Use of Liquid Chromatography-Mass Spectrometry and Matrix-Assisted Laser Desorption Ionization-Time of Flight Mass Spectrometry
... tions of ertapenem ...periods of 2 and 4 ...aliquots of each sample were overlaid with 1 l of ␣-cyano-4-hydroxycinnamic acid matrix solution (HCCA; Bruker Daltonics, Bremen, Germany) and ...
4
A new technique for the direct detection of HO<sub>2</sub> radicals using bromide chemical ionization mass spectrometry (Br-CIMS): initial characterization
... series of ion optics and speci- ated by the time-of-flight ...dance of bromine is such that the adduct is detected at two nominal mass-to-charge ratios, m/z 112 and m/z 114 cor- ...
11
Relating hygroscopicity and composition of organic aerosol particulate matter
... concentrations of ammonium (NH + 4 ), sulfate (SO 2− 4 ), nitrate (NO − 3 ), and OA dur- ing these two field campaigns were obtained from the AMS ...pairing of the in- organic ions, which is required for ...
33
Einstein (São Paulo) vol.10 número1
... Nacional of Vigilância Sanitária (Anvisa) [National Health Surveillance Agency] will not hold registry, so that we can have this powerful resource to benefit our ...
2
Diurnal variations of residential particulate wood burning emissions and their contribution to the concentration of Polycyclic Aromatic Hydrocarbons (PAHs)
... small hourly changes were observed. However, during working days, BBOA and HOA concentrations mainly followed a profile similar to the total OA. Most of the time HOA and BBOA profiles correlate. This leads ...
32
Loading-dependent elemental composition of α-pinene SOA particles
... High-resolution mass spectra presented at unit mass ...contribution of fragments containing C and H ...pink of fragments containing C, H, and O ...example of the deconvolution of ...
31
J. Braz. Chem. Soc. vol.26 número3
... rates of petroleum biodegradation were completely different. Some of the bacteria depleted n-alkanes, whereas others did ...some of these Bacillus strains, revealing their outstanding ability to ...
8
Homemade Capillary Electrophoresis Coupled to a Mass Spectrometer
... function of the microcontroller is to digitize the analogical voltage and current information provided by the power supply for display on a LCD (16 ...functioning of the power supply, the safety mea- ...
9