title: A tandem time-of-flight spectrometer for negative-ion/positive-ion coincidence measurements with soft x-ray excitation.
abstract: We present a newly constructed spectrometer for negative-ion/positive-ion coincidence spectroscopy of gaseous samples. The instrument consists of two time-of-flight ion spectrometers and a magnetic momentum filter for deflection of electrons. The instrument can measure double and triple coincidences between mass-resolved negative and positive ions with high detection efficiency. First results include identification of several negative-ion/positive-ion coincidence channels following inner-shell photoexcitation of sulfur hexafluoride (SF6).
authors.affiliation: MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden.
authors.forename: Christian
authors.initials: C
authors.lastname: Stråhlman
authors.affiliation: MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden.
authors.forename: Rami
authors.initials: R
authors.lastname: Sankari
authors.affiliation: Consiglio Nazionale delle Ricerche-Istituto Officina dei Materiali, Laboratorio TASC, 34149 Trieste, Italy.
authors.forename: Antti
authors.initials: A
authors.lastname: Kivimäki
authors.affiliation: Elettra-Sincrotrone Trieste, Area Science Park, 34149 Trieste, Italy.
authors.forename: Robert
authors.initials: R
authors.lastname: Richter
authors.affiliation: Consiglio Nazionale delle Ricerche-Istituto di Struttura della Materia, 34149 Trieste, Italy.
authors.forename: Marcello
authors.initials: M
authors.lastname: Coreno
authors.affiliation: MAX IV Laboratory, Lund University, P.O. Box 118, 22100 Lund, Sweden.
authors.forename: Ralf
authors.initials: R
authors.lastname: Nyholm