For trans-uranium elements, stable atomic isobars do not exist. In order to provide isobaric reference ions for the mass measurement of trans-uranium elements, an electrospray ion source (ESI) was combined with an rf-carpet to collect molecular ions efficiently. The rf-carpet allows for simplification of the pumping system to transport ions from the ESI to a precision mass analyzer. Molecular ions appropriate for isobaric references of trans-uranium elements were extracted from the rf-carpet and analyzed by a multi-reflection time-of-flight mass spectrograph (MRTOF-MS) with a resolving power of Rm≳100,000.
@article{arxiv.1211.1448,
title = {An rf-carpet electrospray ion source to provide isobaric mass calibrants for trans-uranium elements},
author = {S. Naimi and S. Nakamura and Y. Ito and H. Mita and K. Okada and A. Ozawa and P. Schury and T. Sonoda and A. Takamine and M. Wada and H. Wollnik},
journal= {arXiv preprint arXiv:1211.1448},
year = {2015}
}