desiree d ouble e lectro- s tatic i on r ing e xp- e riment albanova instrumentation seminar...
TRANSCRIPT
![Page 1: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/1.jpg)
DESIREEDESIREE
DDoubleouble
EElectro-lectro-
SStatictatic
IIonon
RRinging
EExp-xp-
EErimentriment
Albanova Albanova Instrumentation Instrumentation
SeminarSeminar
2003-10-302003-10-30
HenningHenningSchmidtSchmidt
![Page 2: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/2.jpg)
Timeline:• 1997: First electrostatic ion storage ring ELISA at Århus University
• 1999: Application to NFR for single ring(Larsson, Cederquist, Schmidt) - Not granted.
• 2001: Application to VR for Double-Ring DESIREE (Skeppstedt, Rensfelt, Danared). Outcome: funding for Design Study.
• October 2002: Design Report submitted to VR.Decision postponed due to the uncertain future of MSL.
• June 2003: VR decision to cease funding of MSL
• October 2003: DESIREE gets funding from Wallenberg and VR
• Soon: All the questions of who, where, and when finds their answers and, the design is finished and construction commences.
• 2005 or thereabouts: Inauguration party!
![Page 3: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/3.jpg)
Outline• The DESIREE project
– Motivation: Mutual Neutralization– Technical description– Planned experiments
• AMO Physics– Examples:
Mutual NeutralizationInterstellar Ion Chemistry
• Biomolecules– Example: ‘Electron Capture Dissociation’
• Summary
![Page 4: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/4.jpg)
Plasma environments:Plasma environments:• The degree of ionization is a determining The degree of ionization is a determining
factor for the ongoing chemistry. factor for the ongoing chemistry. Processes that affect this parameter are Processes that affect this parameter are therefore crucial.therefore crucial.
• Electron-Ion recombination:Electron-Ion recombination:– XX+ + + e+ e- - X + h X + h (atomic recombination) (atomic recombination)
ABAB+ + + e+ e- - A + B (dissociative recombination) A + B (dissociative recombination)
• Mutual Neutralization :Mutual Neutralization :– XX++ + Y + Y-- X + Y X + Y
AA-- + BC + BC++ A + BC or A + B + C or ... A + BC or A + B + C or ...
![Page 5: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/5.jpg)
DESIREEDESIREEDDouble ouble EElectro-lectro-SStatic tatic IIon on RRing ing EExpxpEErimentriment
1 m
• Double-walled vacuum vesselDouble-walled vacuum vessel– Outer tank 300K - Inner tank 15KOuter tank 300K - Inner tank 15K
– Cooling by cryogeneratorsCooling by cryogenerators
• Expected vacuum in inner partExpected vacuum in inner part– 300 K: <10300 K: <10-11-11 mbar mbar
– 15 K: Density reduced by order(s) of 15 K: Density reduced by order(s) of magnitudemagnitude
Ion sources:Plasma Ion SourcesSputter Source (Negative Ions)ESI Source (Biomolecules)ECRIS (Highly Charged Ions)+ new ideas….
ELISAELISA
![Page 6: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/6.jpg)
Mutual Neutralization AnimationMutual Neutralization Animation
![Page 7: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/7.jpg)
1 m
Position-sensitive detector
DESIREE
ELISA
![Page 8: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/8.jpg)
Merging / de-merging
tan = 0.02 (corresponds to 4 eV transverse on 10 keV beam)
![Page 9: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/9.jpg)
Merged-beams experiments
• Longitudinally: Kinematical compression
• Transversely: Ion optics determines: < 1 eV seems feasible.
• Can beam cooling be developed?
Relative velocity definition:
• Example: MN H-+H2+
E=10 keV/amu, Erel=1 eV, Amax=1 cm2,=1.6.10-14cm2 (COB), I+=I-=100 nA, L=80 cm: 44 s-1
• Background rate is similar - The key point is that in MN there are (at least) two neutrals in coincidence!!
• How about experiments with Biomolecules?
Count Rate estimates:
RN: In above example N=4.106. Feasible for ESI with trap
0
5
10
15
20
25
-10 -5 0 5 10
v
E
• Longitudinally: Kinematical compression
![Page 10: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/10.jpg)
Three special features of DESIREE:
• Double-ring structure:– Merged beams positive/negative ion collisions.
• Cryogenic system:– Extremely good vacuum Long storage lifetime.– Internally cold molecular ions.
• Electrostatic confinement:– High mass-to-charge ratios (i.e. Biomolecules).– Absence of magnetic-field mixing in lifetime
measurements
![Page 11: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/11.jpg)
• Atoms and ‘Small’ Molecules:– Single-Ring Experiments
• Lifetime measurements of metastable ions (He-, C60q+,…)
• LASER spectroscopy and lifetime measurements– Atomic ions (Continuation of CRYRING project, Mannervik)
– Molecular ions (e.g. Cn-)
– Merged-Beams Experiments• Mutual Neutralization Collisions
– Fundamental systems (e.g. H-+H2+ … DR below 0 eV)
– Astrophysical plasmas (e.g. Cn-+H3
+, H3O+,….)
Examples of proposed experiments at the DESIREE
facility:• Atoms and ‘Small’ Molecules:
– Single-Ring Experiments• Lifetime measurements of metastable ions (He-, C60
q+,…)
• LASER spectroscopy and lifetime measurements– Atomic ions (Continuation of CRYRING project, Mannervik)
– Molecular ions (e.g. Cn-)
– Merged-Beams Experiments• Mutual Neutralization Collisions
– Fundamental systems (e.g. H-+H2+ … DR below 0 eV)
![Page 12: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/12.jpg)
Astrophysics and DESIREE
• Diffuse interstellar clouds:
• Star formation and ion chemistry.– Formation of polyatomic
molecules
– (e.g. H2+ + H2 H3
+ + H)
Two processes limit positive ion abundance:Dissociative Recombination (AB+ + e- A + B)Mutual Neutralization (X+ + Y- X + Y)
Are there any negative ions in the interstellar medium?
![Page 13: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/13.jpg)
’The negative charges may reside more in the form of anions than electrons and mutual neutralization may replace dissociative recombination as the main mechanism for removing positive ions.” Proc. of the 1999 conf on Dissociative Recombination, eds M. Larsson, J.B.A. Mitchell and I.F. Schneider (2000)
Astrophysics and DESIREE
• Old puzzle: Diffuse interstellar absorption bands.– Recent interesting candidates are carbon chain anions:
Cn- (n=6,7,8,9) Tulej et al, Astrophys. J, 506, L69 (1998)
• Alexander Dalgarno, 1999:Cn
- + H2+
H3+
H3O+
CH5+
etc...
![Page 14: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/14.jpg)
• Atoms and ‘Small’ Molecules:– Single-Ring Experiments
• Lifetime measurements of metastable ions (He-, C60q+,…)
• LASER spectroscopy and lifetime measurements– Atomic ions (Continuation of CRYRING project, Mannervik)
– Molecular ions (e.g. Cn-)
– Merged-Beams Experiments• Mutual Neutralization Collisions
– Fundamental systems (e.g. H-+H2+ … DR below 0 eV)
– Astrophysical plasmas (e.g. Cn-+H3
+, H3O+,….)
Examples of proposed experiments at the DESIREE
facility:• Atoms and ‘Small’ Molecules:
– Single-Ring Experiments• Lifetime measurements of metastable ions (He-, C60
q+,…)
• LASER spectroscopy and lifetime measurements– Atomic ions (Continuation of CRYRING project, Mannervik)
– Molecular ions (e.g. Cn-)
– Merged-Beams Experiments• Mutual Neutralization Collisions
– Fundamental systems (e.g. H-+H2+ … DR below 0 eV)
– Astrophysical plasmas (e.g. Cn-+H3
+, H3O+,….)
– Atmospherical ion chemistry.
• Collisions involving fullerenes (C60q++C60
-, Ar8++C60-,….)
![Page 15: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/15.jpg)
Examples of proposed experiments at the DESIREE
facility:• Biomolecules:
– Production, accumulation, conformere selection• The ELISA injector system:
![Page 16: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/16.jpg)
• Biomolecules:– Single-Ring Experiments (already pursued at ELISA)
• Lifetime and stability(J.U.Andersen et al, Eur. Phys. J. D 25, 139 (2003)
• LASER spectroscopy(e.g. GFP: S.B.Nielsen et al PRL 87, 228102 (2001))
• Biomolecules:
Examples of proposed experiments at the DESIREE
facility:
![Page 17: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/17.jpg)
![Page 18: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/18.jpg)
GFP: S.B.Nielsen et al PRL 87, 228102 (2001)
![Page 19: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/19.jpg)
• Biomolecules:– Single-Ring Experiments (already pursued at ELISA)
• Lifetime and stability(J.U.Andersen et al, to be published)
• LASER spectroscopy(e.g. GFP: S.B.Nielsen et al PRL 87, 228102 (2001))
– Merged-Beams Experiments• Electron Capture Dissociation in Negative/Positive ion collisions • Coulombic explosions induced by highly charged ions
• Biomolecules:
Examples of proposed experiments at the DESIREE
facility:• Biomolecules:
– Single-Ring Experiments (already pursued at ELISA)• Lifetime and stability
(J.U.Andersen et al, to be published)
• LASER spectroscopy(e.g. GFP: S.B.Nielsen et al PRL 87, 228102 (2001))
![Page 20: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/20.jpg)
Electron Capture Dissociation
• ECD is important in protein sequencing because it breaks other bonds than those accessed in collision-induced dissociation.
• ECD is studied by introducing electrons in the plasma of FT-ICR mass spectrometer. No control of electron impact energy.
• Using simple negative ion to carry the electron, low (even below zero) and well-controlled relative energy is obtained.
![Page 21: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/21.jpg)
Electron-transfer
10 a0
10 a0
![Page 22: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/22.jpg)
Area of impact for ’distant’ collisions.
• Experimental indication of distant collision:– Detection of neutral at
proper time in relation to the arrival of the biomolecule(ar fragments)
![Page 23: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/23.jpg)
Summary:
• DESIREE can be built!
• We can do new AMO physics in single-ring and particularly in merged-beams configuration (Mutual Neutralization)
• Spectroscopy and lifetime measurements for biomolecular ions - ELISA
• ’ECD’ like processes and HCI-biomolecular ion interaction in merged-beams - DESIREE unique
The End!
![Page 24: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/24.jpg)
DESIREE People:
• Main Applicant: Ö. Skeppstedt (MSL)• Design group: (MSL + SU)
K-G Rensfelt, M. Andersson, L. Bagge,H. Danared, J. Jensen, L. Liljeby, H.T. Schmidt, K. Schmidt, A. Simonsson
• Contributors to the Scientific Programme: (SU + ..)H. T. Schmidt, H. Cederquist, T. Hansson,J. Jensen, M. Larsson, S. Mannervik,P. vd Meulen, J. Pettersson. P. Royen,E. Uggerud, R. A. Zubarev
![Page 25: DESIREE D ouble E lectro- S tatic I on R ing E xp- E riment Albanova Instrumentation Seminar 2003-10-30 Henning Schmidt](https://reader035.vdocument.in/reader035/viewer/2022070410/56649ed35503460f94be3a61/html5/thumbnails/25.jpg)
Mutual Neutralization AnimationMutual Neutralization Animation