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A Hadamard transform electron ionization time-of-flight mass spectrometer
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10.1063/1.2838174
/content/aip/journal/rsi/79/1/10.1063/1.2838174
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/1/10.1063/1.2838174
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Diagram of the apparatus.

Image of FIG. 2.
FIG. 2.

Graph of the ion birth potential energy distribution at electron energy observed for the ( 20) peak by a series of reflectron measurements. The birth potentials indicate that the ion energy spread is .

Image of FIG. 3.
FIG. 3.

Hadamard transform TOF spectra of argon (ionizer ) collected at (1 sequence ) demonstrating effects of mask error on transformed spectra collected using sequences of three constructions. The traces are truncated and display only the part of the spectrum exhibiting features. All traces share the same vertical axis scale factor (see text). (a) (maximal shift construction) encoding, containing no programmed mask error, exhibiting unperturbed 20 and 40 peaks; (b) encoding, which has its sequence distorted by extending the 0 mask element by at each 0-1 transition; (c) encoding, which has its sequence distorted by extending the 1 mask element for at each 1-0 transition; (d) (twin prime construction) encoding, which has its sequence distorted by extending the 0 mask element for at each 0-1 transition; (e) (quadratic residue construction), which has its sequence distorted by extending the 1 mask element for at each 1-0 transition; (f) containing no programmed mask error.

Image of FIG. 4.
FIG. 4.

Conventional TOF ( ionization pulse) and HT-TOF mass spectra of PFTBA (; ionizer ). All traces share the same vertical axis scale factor (see text). (a) Conventional TOF mass spectrum; (b) HT-TOF mass spectrum collected using the matrix of maximal shift register construction; (c) HT-TOF mass spectrum collected using the matrix of quadratic residue construction; (d) HT-TOF mass spectrum collected using the matrix of twin prime construction. The HT-TOF traces are truncated to display only the part of the spectrum exhibiting peaks.

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/content/aip/journal/rsi/79/1/10.1063/1.2838174
2008-01-31
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: A Hadamard transform electron ionization time-of-flight mass spectrometer
http://aip.metastore.ingenta.com/content/aip/journal/rsi/79/1/10.1063/1.2838174
10.1063/1.2838174
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