The hows and whys of ion trapping

Trapping and detection of ions generated in a high magnetic field electrospray ionization fourier transform ion cyclotron resonance mass spectrometer

“…Typical magnet bore lengths are 50 to 80 em, which suggests that at most 20 to 30 em may separate the analyzer trapped ion cell and ESI source regions if duces overall trapping efficiency. A second, more poorly understood approach is to maintain static trap potentials as ions bombard the cell and accumulate in the potential well between the trap plates [28,29]. The advantage of accumulated trapping for electrospray ionization is that, provided an efficient trapping mechanism is found, ionization duty cycle is superior and FTICR sensitivity should also improve.…”

Laser desorption from a probe in the cavity of a quadrupole ion storage mass spectrometer

“…In recent years a new approach to the operation of the quadrupole ion storage trap, or QUISTOR (1), has been introduced which has greatly expanded its utility as an analytical mass spectrometer (2). This new approach, commercialized by the Finnigan Corp. (San Jose, CA), involves the use of the "mass selective instability" scanning mode, wherein trapped ions are successively allowed to become unstable and fall out of the trap to strike a detector.…”

Μελέτη Των Πολικών Και Μη Πολικών Οργανικών Ενώσεων Στη Λεκάνη Απορροής Του Ποταμού Στρυμόνα Με Συνδυασμό Ενεργής Και Παθητικής Δειγματοληψίας

“…Η παγίδα ηφλησλ είλαη κία δηάηαμε, φπνπ δεκηνπξγνχληαη αληφληα ή θαηηφληα ζε αέξηα θαηάζηαζε θαη πεξηνξίδνληαη γηα αξθεηφ δηάζηεκα κε έλα ειεθηξηθφ ή/θαη καγλεηηθφ πεδίν. Έρνπλ αλαπηπρζεί δηάθνξνη ηχπνη παγίδσλ ηφλησλ (Allison et al, 1987;Cooks et al, 1991;McLuckey et al, 1994;Stafford et al, 1983), δπν απφ ηνπο νπνίνπο ρξεζηκνπνηνχληαη ζήκεξα ζε εκπνξηθψο δηαζέζηκα θαζκαηφκεηξα καδψλ.…”