Schematic of the rf oscillator circuit. The connections of the transformer coils at points , , , and are elaborated in Fig. 4.
(Color online) Radio frequency oscillator printed circuit board.
(Color online) Radio frequency oscillator with the transformer coil, power supply, and the cooling fan enclosed in a shielded box.
(Color online) Cross section of the transformer coil. Out (+) and out (−) are connected to the electrodes of the ion guide. , and are the secondary coil, feedback coil, and rf sensing loop, respectively. b and are the center tap of primary and secondary coils, respectively. [Refer to Fig. 1(a) for connections of the coils.]
(a) Mass spectrum of ubiquitin obtained using the rf oscillator to drive the hexapoles. (b) Mass spectrum of ubiquitin after heating the ions with a laser.
A low mass DHB dimer is observed testing the low transfer capability of the hexapoles driven by the rf oscillator PCB.
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