Characterization of a new electrostatic storage ring for photofragmentation experiments

Pedersen, H. B.; Svendsen, Annette; Harbo, L. S.; Kiefer, Hjalte V.; Kjeldsen, H.; Lammich, Lutz; Toker, Yoni; Andersen, Lars H.

doi:10.1063/1.4922826

Cited by 24 publications

(15 citation statements)

References 36 publications

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“…The experiments are performed at the ion-storage ring SAPHIRA 38 (Fig. 1a), where RPSB chromophore ions (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1Experimental technique. a The experimental setup at the electrostatic ion-storage ring SAPHIRA 38 . Ions are produced by electrospraying retinal chromphores dissolved in methanol.…”

Section: Resultsmentioning

confidence: 99%

“…The experiments were performed at the SAPHIRA electrostatic ion-storage ring 38,45 , where an electrospray ion source with a multipole ion trap was used to produce bunches of bio-chromophores in vacuo.…”

Section: Methodsmentioning

confidence: 99%

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Intrinsic photoisomerization dynamics of protonated Schiff-base retinal

et al. 2019

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The retinal protonated Schiff-base (RPSB) in its all-trans form is found in bacterial rhodopsins, whereas visual rhodopsin proteins host 11-cis RPSB. In both cases, photoexcitation initiates fast isomerization of the retinal chromophore, leading to proton transport, storage of chemical energy or signaling. It is an unsolved problem, to which degree this is due to protein interactions or intrinsic RPSB quantum properties. Here, we report on time-resolved action-spectroscopy studies, which show, that upon photoexcitation, cis isomers of RPSB have an almost barrierless fast 400 fs decay, whereas all-trans isomers exhibit a barrier-controlled slow 3 ps decay. Moreover, formation of the 11-cis isomer is greatly favored for all-trans RPSB when isolated. The very fast photoresponse of visual photoreceptors is thus directly related to intrinsic retinal properties, whereas bacterial rhodopsins tune the excited state potential-energy surface to lower the barrier for particular double-bond isomerization, thus changing both the timescale and specificity of the photoisomerization.

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“…The experiments are performed at the ion-storage ring SAPHIRA 38 (Fig. 1a), where RPSB chromophore ions (Fig.…”

Section: Resultsmentioning

confidence: 99%

“…1Experimental technique. a The experimental setup at the electrostatic ion-storage ring SAPHIRA 38 . Ions are produced by electrospraying retinal chromphores dissolved in methanol.…”

Section: Resultsmentioning

confidence: 99%

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Intrinsic photoisomerization dynamics of protonated Schiff-base retinal

et al. 2019

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“…In a separate measurement, we could determine the detachment cross section for OH − FIG. 16. Count rate of neutral products photodetached by a HeNe laser from a 60 keV Ag − 2 beam in the CSR (temperature ∼ 6 K) and detected by COMPACT as a function of the storage time t. The laser was modulated between "on" and "off" at a period of 500 s with duty cycles c1 and c2 as given, and the rates during the "on" phases are plotted.…”

Section: H Lifetime Measurements and Negative Ion Detachmentmentioning

confidence: 99%

The cryogenic storage ring CSR

Hahn

Becker

Berg

et al. 2016

Review of Scientific Instruments

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An electrostatic cryogenic storage ring, CSR, for beams of anions and cations with up to 300 keV kinetic energy per unit charge has been designed, constructed, and put into operation. With a circumference of 35 m, the ion-beam vacuum chambers and all beam optics are in a cryostat and cooled by a closed-cycle liquid helium system. At temperatures as low as (5.5 ± 1) K inside the ring, storage time constants of several minutes up to almost an hour were observed for atomic and molecular, anion and cation beams at an energy of 60 keV. The ion-beam intensity, energy-dependent closed-orbit shifts (dispersion), and the focusing properties of the machine were studied by a system of capacitive pickups. The Schottky-noise spectrum of the stored ions revealed a broadening of the momentum distribution on a time scale of 1000 s. Photodetachment of stored anions was used in the beam lifetime measurements. The detachment rate by anion collisions with residual-gas molecules was found to be extremely low. A residual-gas density below 140 cm(-3) is derived, equivalent to a room-temperature pressure below 10(-14) mbar. Fast atomic, molecular, and cluster ion beams stored for long periods of time in a cryogenic environment will allow experiments on collision- and radiation-induced fragmentation processes of ions in known internal quantum states with merged and crossed photon and particle beams.

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“…Beam storage in a heavy-ion storage ring would provide a solution, but has not been realized so far because it would require a major investment. Recent progress in this direction has been made by the construction of a low-cost electrostatic storage ring for photon-ion interaction experiments, in particular, for the photofragmentation of small molecular ions [80]. However, so far the ion storage times in this device are still rather short.…”

Section: Discussionmentioning

confidence: 99%

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages

Schippers

Kilcoyne

Phaneuf

et al. 2015

Contemporary Physics

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The photon-ion merged-beams technique for the photoionization of mass/charge selected ionized atoms, molecules and clusters by x-rays from synchrotron radiation sources is introduced. Examples for photoionization of atomic ions are discussed by going from outer-shell ionization of simple few-electron systems to inner-shell ionization of complex many-electron ions. Fundamental ionization mechanisms are elucidated and the importance of the results for applications in astrophysics and plasma physics is pointed out. Finally, the unique capabilities of the photon-ion merged-beams technique for the study of photoabsorption by nanoparticles are demonstrated by the example of endohedral fullerene ions.

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Characterization of a new electrostatic storage ring for photofragmentation experiments

Cited by 24 publications

References 36 publications

Intrinsic photoisomerization dynamics of protonated Schiff-base retinal

Intrinsic photoisomerization dynamics of protonated Schiff-base retinal

The cryogenic storage ring CSR

Photoionisation of ions with synchrotron radiation: from ions in space to atoms in cages

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