Accession Number:

ADA429458

Title:

Hadamard Transform Time-of-Flight Mass Spectrometry

Descriptive Note:

Final rept.

Corporate Author:

SOUTHWEST SCIENCES INC SANTA FE NM

Personal Author(s):

Report Date:

2004-11-30

Pagination or Media Count:

15.0

Abstract:

This program applied the Hadamard transform method to atmospheric pressure ion mobility separation IMS for the analysis of trace species. Target applications include chemical and biological agent detection as well as protein sequencing and identification. We demonstrate that the Hadamard transform approach improves sensitivity by increasing sample throughput, yet requires only minimal modification to the existing hardware. In Phase I we programmed commercially available DSP electronics that operated an existing IMS for Hadamard transform modulation and collected ion signal synchronous with yet at higher rates than the Hadamard modulation sequence. This strategy allows for parsing of the analog signal to avoid noise associated with the pulsing of the Bradbury Nielson ion gate and also allowed for easy comparison of various modulation rates and sequence lengths.

Subject Categories:

  • Numerical Mathematics
  • Atomic and Molecular Physics and Spectroscopy
  • Chemical, Biological and Radiological Warfare

Distribution Statement:

APPROVED FOR PUBLIC RELEASE