Carbon cluster mass calibration at SHIPTRAP [Elektronische Ressource] / vorgelegt von Ankur Chaudhuri

Carbon-cluster mass calibration at SHIPTRAPInaguraldissertationzurErlangung des akademischen Gradesdoktor rerum naturalium (Dr. rer. nat)an der Mathematisch-Naturwissenschaftlichen Fakult˜atderErnst-Moritz-Arndt-Universit˜at Greifswaldvorgelegt vonAnkur Chaudhuri, M.Sc.geboren am 1. Juli, 1975in Raigunj, IndienGreifswald, 2007Dekan: Prof. Dr. Klaus Fesser1. Gutachter: Prof. Dr. Lutz SchweikhardErnst-Moritz-Arndt-Universit˜at Greifswald2. Gutachter: Prof. Dr. Kumar Satish SharmaUniversity of Manitoba, CanadaTag der Promotion: 10.12.2007AbstractA carbon-cluster ion source has been installed and tested at SHIPTRAP, thePenning-trap mass spectrometer for mass measurements of heavy elementsat GSI/Darmstadt, Germany. A precision mass determination is carried outby measuring the ion cyclotron frequency ! = qB=m, where q=m is theccharge-to-mass ratio of the ion and B is the magnetic fleld. The mass of the ionof interest is obtained from the comparison of its cyclotron frequency ! withcthat of a well-known reference ion. Carbon clusters are the mass reference ofchoice since the unifled atomic mass unit is deflned as 1/12 of the mass of the12 12C atom. Thus the masses of carbon clusters C , n=1,2,3,... are multiples ofnthe unifled atomic mass unit.12 +Carbon-cluster ions C , 5 • n • 23, were produced by laser-inducedndesorption and ionization from a carbon sample.