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The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics
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View: Figures


Image of FIG. 1.
FIG. 1.

Cross section view of the multiplexed PIMS.

Image of FIG. 2.
FIG. 2.

Cross section view of the reactor tube, mass spectrometer, and detector region. (A) pinhole, (B) ion optics, (C) electrostatic sector, (D) magnetic sector, (E) 2D time- and position-sensitive detector, (F) partition wall dividing the ionization region from the detection region for the purposes of differential pumping, (G) pumping ports for the ionization region, and (h) pumping port for the detector region.

Image of FIG. 3.
FIG. 3.

Schematic of the ion detector and the data acquisition system. Components of the system: (D) delay to ensure stop always follows start, (A) fast analog amplifier, (CFD) constant fraction discriminator, (TDC) time to digital converter, (TS) time stamping board, and (DMA) dynamic memory access data acquisition card.

Image of FIG. 4.
FIG. 4.

Time-independent mass spectrum of a dilute mixture. (A) 2D spatial image of ion positions on the detector. The axis is linear in physical space, whereas the axis has been transformed so that it is linear in ratio. (B) Corrected spatial ion image (see text); (C) 1D mass spectra corresponding to panels A and B.

Image of FIG. 5.
FIG. 5.

Representation of a 3D data cube. Three orthogonal 2D slices are shown as images, along with 1D profiles extracted from these images.

Image of FIG. 6.
FIG. 6.

Time profile of ions observed in the photolysis of acetone. (a) Complete profile. The increase in signal beginning at is due to pump out of the irradiated gases. (b) Response near the laser pulse at . The conditions in this graph are , , , , , , , , , , laser pulses, and .

Image of FIG. 7.
FIG. 7.

PIE curve of a known mixture of isomers. The dashed lines show basis functions (PIE curves of pure isomers). The solid line is the best fit using Eq. (4).


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The multiplexed chemical kinetic photoionization mass spectrometer: A new approach to isomer-resolved chemical kinetics