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In this method, spectra are collected alternating between low- and high-collision energies; no selective mass filtering is performed.

Experimental mass spectra are shown for H2+, D2+, and He+ ions to provide proof of principle that the DLP mass filter is working as a mass analyzer in the low-mass range (1 to 10 amu).

The combination of Q1 and Q3 mass filters is called an SRM/MRM transition, which can be changed every few msec, and hundreds of SRM/MRM transitions can be simultaneously monitored in a single analysis.

The temperature of quadrupole mass filter was set at 150 °C.

In other experiments where the mass filter was not used (data not shown), no OFN (1 pg) could be detected in the presence of 1% diesel.

A quadrupole mass filter was included in the GC/Q-Orbitrap design to boost instrument sensitivity in targeted and trace analyses, used in experiments such as targeted selected ion monitoring (SIM), targeted MS/MS, or data-dependent MS/MS.

To remove small undulations at the fronts, a mass-conserving filter is employed.

The first quadrupole mass filter, Q1, is then employed to selectively pass the (M-1)- ion into a second quadrupole filter containing argon or neon at 10 -3) torr.

Once the size clusters are selected by the MesoQ mass filter, they are accelerated by applying a bias voltage (Vb) to a substrate in a high vacuum with a base pressure of 10-8 Torr.

The comparable signal-to-noise ratio of the apparatus and a research-grade fluorescent dissecting microscope show that the use of mass production dichroic filters is a pragmatic compromise between costs and performance.

To increase filter mass loading, filters were exposed repeatedly between 2 and 5 times, but only on the same day of the week as previous collections (i.e., all Monday sampling occurred on the same filter).