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- W1527299042 abstract "The low density of ions in mass spectrometers generally precludes direct absorptionmeasurements. The spectrum of ions can nonetheless be obtained by using resonance two-color photofragmentation or multiphoton photofragmentation techniques. InBasel an ion-trap instrument has been built to measure the electronic spectra of cations at lowvibrational and rotational temperatures (20-40 K), as of relevance to astronomical observations.Ions are produced in an electron-impact ion source and are mass selected with a quadrupole filterbefore being fed into a 22-pole radio-frequency trap. Typically 3000 ions are held forapproximately 70 ms, during which the ions are equilibrated to low temperatures throughcollisions with cryogenically cooled helium gas. Subsequently an electronic transition is inducedthrough excitation with a tunable nanosecond laser. A second UV photon then initiatesphotofragmentation of the excited ions. Afterward the trap is opened and the fragment ions aremass selected by a second quadrupole and detected. The recently obtained results of the excitedstates of some polyacetylene cations, caynogen cation, C4H3Cl+ cation in the gas phase arepresented." @default.
- W1527299042 created "2016-06-24" @default.
- W1527299042 creator A5070067449 @default.
- W1527299042 date "2010-01-01" @default.
- W1527299042 modified "2023-09-26" @default.
- W1527299042 title "Electronic spectroscopy of cold ions in a radio-frequency trap" @default.
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- W1527299042 doi "https://doi.org/10.5451/unibas-005222192" @default.
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