title: A new technique for time-resolved daughter ion mass spectrometry on the microsecond to millisecond time scale using an electrostatic ion storage ring.
abstract: A new method for time-resolved daughter ion mass spectrometry is presented, based on the electrostatic ion storage ring in Aarhus, ELISA. Ions with high internal energy, e.g., as a result of photoexcitation, dissociate and the yield of neutrals is monitored as a function of time. This gives information on lifetimes in the microsecond to millisecond time range but no information on the fragment masses. To determine the dissociation channels, we have introduced pulsed supplies with switching times of a few microseconds. This allows rapid switching from storage of parent ions to storage of daughter ions, which are dumped into a detector after a number of revolutions in the ring. A fragment mass spectrum is obtained by monitoring the daughter ion signal as a function of the ring voltages. This technique allows identification of the dissociation channels and determination of the time dependent competition between these channels.
authors.affiliation: Institute for Storage Ring Facilities, University of Aarhus, Ny Munkegade, DK-8000 Aarhus C, Denmark.
authors.forename: Kristian
authors.initials: K
authors.lastname: Støchkel
authors.forename: Umesh
authors.initials: U
authors.lastname: Kadhane
authors.forename: Jens Ulrik
authors.initials: JU
authors.lastname: Andersen
authors.forename: Anne I S
authors.initials: AI
authors.lastname: Holm
authors.forename: Preben
authors.initials: P
authors.lastname: Hvelplund
authors.forename: Maj-Britt Suhr
authors.initials: MB
authors.lastname: Kirketerp
authors.forename: Mikkel Koefoed
authors.initials: MK
authors.lastname: Larsen
authors.forename: Morten Køcks
authors.initials: MK
authors.lastname: Lykkegaard
authors.forename: Steen Brøndsted
authors.initials: SB
authors.lastname: Nielsen
authors.forename: Subhasis
authors.initials: S
authors.lastname: Panja
authors.forename: Henning
authors.initials: H
authors.lastname: Zettergren
mesh_terms: D000465:Algorithms; D011211:Electric Power Supplies; D055590:Electromagnetic Phenomena / Q000295:instrumentation*; D004867:Equipment Design; D019544:Equipment Failure Analysis; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*; D021241:Spectrometry, Mass, Electrospray Ionization / Q000295:instrumentation* / Q000379:methods; D055672:Static Electricity; D013997:Time Factors; D014159:Transducers