. Author manuscript; available in PMC: 2017 Nov 16.

Published in final edited form as: Geochim Cosmochim Acta. 2013 Dec 7;127:326–347. doi: 10.1016/j.gca.2013.11.030

Table 1.

Assignment of ion collectors for isotope analyses of heavy noble gases. All Kr and Xe isotopes are measured simultaneously in only four steps of magnet field and zoom lens, with Kr being analyzed twice using adjacent detectors for internal calibration of counting efficiencies. No changing of magnetic field and zoom lens are needed for Ar analyses.

Magnet, Zoom lens settings	Ion collectors (EM – electron multipliers, FC – Faraday Cup)
	FC	EM1	EM2	EM3	EM4	EM5	EM6	EM7	EM8
B1, Z1		¹³⁶Xe	¹³⁴Xe	¹³²Xe	¹³⁰Xe	¹²⁸Xe	¹²⁶Xe	¹²⁴Xe
B2, Z2				¹³¹Xe	¹²⁹Xe
B3, Z3		⁸⁶Kr		⁸⁴Kr	⁸³Kr	⁸²Kr		⁸⁰Kr
B4, Z4	⁸⁶Kr		⁸⁴Kr	⁸³Kr	⁸²Kr		⁸⁰Kr		⁷⁸Kr
B5, Z5	⁴⁰Ar				³⁸Ar		³⁷Cℓ		³⁶Ar