A Paul ion trap mass spectrometer with fractional resolution of m/Deltam=1565 was constructed and tested. The major improvement in this new trap over that previously reported with m/Deltam=324 Rev. Sci. Instrum. 73, 2157 (2002) was due to tighter machining tolerances of the hyperboloidal surfaces, with minor improvement due to better stability of the amplitude of the radio frequency trapping voltage. The present resolution is shown to be sufficient to separate clearly (to baseline) the following masses: He-4(+) and D2+ (0.0256 u separation), He-3(+) and H-3(+) (0.0074 u), He-3(+) and HD+ (0.0059 u), and He-4(2+) and H-2(+) (0.0143 u separation). Resolution of He-4(+) and HT+ (0.0043 u separation) should also be possible, but was not carried out. Resolution of H-3(+) and HD+ (0.0015 u separation) is possible with peaks of comparable intensity, or with deconvolution. (C) 2003 American Institute of Physics. References: 7
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