1. Dissociative recombination of CH 2 OH + and CD 2 OD + Mathias Hamberg Wolf Geppert, Richard Thomas Fabian Österdahl, Vitaly Zhaunerchyk, Jacek Semaniak, Magdalena Kaminska Magnus af Ugglas, Anders Källberg Mats Larsson

2. Ion-electron processes AB + (v=n) + e - AB + h Radiative recombination (slow) AB + (v≠n) + e - Elastic and superelastic scattering A + + B - Resonant ion pair formation A + B Dissociative Recombination (DR)

3. DR example + e-e- e-e-

4. Direct process AB**AB + Internuclear separation Potential energy A+B + A+B

5. Indirect process AB**AB + Internuclear separation Potential energy AB* A+B + A+B

6. Where can we find Dissociative recombination process ? Comas of comets The northern lights Dark clouds Tukamak plasma’s Lightning

7. Why CH 2 OH + and CD 2 OD + ? Alcohols are fun So are their products Previous investigations about methanol Significant pathways for production and destruction of: NH 4 +, NH 3, H 2 O, H 3 O + Pathways competes with DR-reaction

8. How and what JIMIS hollow cathode ion source Isomerization? Symmetries, energy barrier? Hydroxymethylion CH 2 OH + CH 2 OH + Methoxy ion CH 2 OH + CH 2 OH +

9. CRYRING Formation of the ions with JIMIS Mass selection with bending magnet RFQ Injection Acceleration via RF e - -cooler Cooling and interaction region Detection of neutrals with SBD

10. e - -cooler

11. Detection

12. Branching Ratios Spectrum for CH 2 OH + Spectrum for CD 2 OD + Difficult to resolve

13. Branching Ratios Reaction channels: CH 2 OH + CD 2 OD + CH x O CD x O α H 2 O + CH D 2 O + CD β H 2 O + CH D 2 O + CD β CH 2 + OH CD 2 + OD γ CH 2 + OH CD 2 + OD γ α: non C-O bondbreaking β, γ:C-O bondbreaking

14. TransmissionprobabilityT=0.297 Branching Ratios Probability matrix: P = [TT^2 T^2 0T(1-T) 0 0T(1-T) 0 00 (1-T) 00 (1-T) 0T(1-T) 0 ] 0T(1-T) 0 ] Ch.αβ γ (CH x O) (H 2 O + CH) (CH 2 + OH) (CH x O) (H 2 O + CH) (CH 2 + OH) Measured counts for CH 2 OH + α β γ α β γ

15. Branching Ratios CH 3 O + :CD 3 O + : CH x O + (98%)CD x O + ( 92%) α H 2 O + CH (0.7%)D 2 O + CD (2%) β CH 2 + OH (1.6%) CD 2 + OD (6%) γ Contrary to the CH 3 OH 2 + ion, the pathways preserving the bond between the heavy atoms dominate.

16. Reaction cross section Ramping the cathode voltage linearly according to the figure  The following spectrum was achieved  Cooling 1 eV

17. Reaction cross section Preliminary evaluation of the data yielded a reaction rate coeffecient of CH 2 OH + 6.8*10 -7 (T/300) -0.63 cm 3 mol -1 s -1 CD 2 OD + 8.4*10 -7 (T/300) -0.62 cm 3 mol -1 s -1 Error bars < 15%, biggest factor is the ion current measurement Results ?

18. Discussion Contrary to the CH 3 OH 2 + ion, the pathways preserving the bond between the heavy atoms dominate Contrary to the CH 3 OH 2 + ion, the pathways preserving the bond between the heavy atoms dominate Why? C-O bond has double bond character, although DR is known to often break strong bonds Why? C-O bond has double bond character, although DR is known to often break strong bonds Further investigations will take place in order to increase the resolution and resolve the different CD x O + channels Further investigations will take place in order to increase the resolution and resolve the different CD x O + channels Isomerization: Hydroxymethyl ion CH 2 OH + likely to be dominating during the measurements Isomerization: Hydroxymethyl ion CH 2 OH + likely to be dominating during the measurements Overall impact: Results might be used within astrochemical models Overall impact: Results might be used within astrochemical models

19. Credits Wolf Geppert Mats Larsson Fabian Österdahl Vitali Zhaunerchyk Richard Thomas, Magnus af Ugglas Anders Källberg Ansgar Simonsson,and the rest of the CRYRING-crew