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Fourier transform ion cyclotron resonance spectroscopy

✍ Scribed by Melvin B. Comisarow; Alan G. Marshall

Publisher
John Wiley and Sons
Year
2007
Tongue
English
Weight
122 KB
Volume
31
Category
Article
ISSN
1076-5174

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✦ Synopsis

An ion cyclotron resonance (ICR) absorption spectrum has been obtained by exciting an ICR spectral segment with a fixed-frequency electric field pulse, followed by broad-band detection, digitization of the (rime-domain) transient response, and digital Fourier transformation to produce the (frequencydomain) absorption spectrum.

For a given signal-to-noise ratio and resolution, the FT-ICR method generates a spectrum in a time which is two orders of magnitude shorter than that required in conventional slow-sweep ICR detection. In the present example, a signal-to-noise ratio of 8: i and a mass resolution of about 0.005 amu for CH; (from CH, at a pressure of 8 X lo-' torr) have been achieved, using a single data acquisition period of 25.6 msec.

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