Fragmentation of and electron detachment from hot copper and silver dimer anions: A comparison

Anderson, Emma K.,1986-Stockholms universitet,Fysikum,Aarhus University, Denmark (författare)

Fragmentation of and electron detachment from hot copper and silver dimer anions : A comparison

We measured the spontaneous decays of internally hot copper and silver dimer anions, and , stored in one of the two ion-beam storage rings of the Double Electrostatic Ion Ring Experiment (DESIREE) at Stockholm University. A coincidence detection technique was utilized enabling essentially background-free measurements of -> Cu + Cu- and -> Ag + Ag- fragmentation rates. Furthermore, the total rates of neutral decay products (monomers and dimers) were measured and the relative contributions of fragmentation and electron emission ( -> Cu2 + e- and -> Ag2 + e-) were deduced as functions of storage time. Fragmentation is completely dominant at early times. However, after about 20 ms of storage, electron emission is observed and becomes the leading decay path after 100 ms for both dimer anions. The branching ratios between fragmentation and electron emission (vibrationally assisted autodetachment processes) are very nearly the same for and Ag-2 throughout the present storage cycle of 10 seconds. This is surprising considering the difference between the electron affinities of the neutral dimers, Cu2 and Ag2, and the difference between the and the dissociation energies.

Schmidt-May, Alice Frederike,1988-Stockholms universitet,Fysikum(Swepub:su)alsc7781 (författare)
Najeeb, P. K.,1986-Stockholms universitet,Fysikum(Swepub:su)napu8349 (författare)
Eklund, Gustav,1990-Stockholms universitet,Fysikum(Swepub:su)guek5896 (författare)
Chartkunchand, K. C. (författare)
Rosén, Stefan,1967-Stockholms universitet,Fysikum(Swepub:su)sros (författare)
Kamińska, Magdalena,1981-Stockholms universitet,Fysikum(Swepub:su)magda (författare)
Stockett, Mark H.,1984-Stockholms universitet,Fysikum(Swepub:su)mstoc (författare)
Nascimento, R. (författare)
Hansen, K. (författare)
Larson, Åsa,1972-Stockholms universitet,Fysikum(Swepub:su)aasal (författare)
Cederquist, Henrik,1957-Stockholms universitet,Fysikum(Swepub:su)cederq (författare)
Zettergren, Henning,1975-Stockholms universitet,Fysikum(Swepub:su)henning (författare)
Schmidt, Henning T.,1966-Stockholms universitet,Fysikum(Swepub:su)schmidt (författare)
Stockholms universitetFysikum (creator_code:org_t)

Ingår i:Physical Review A: covering atomic, molecular, and optical physics and quantum information107:62469-99262469-9934

Av författaren/redakt...: Anderson, Emma K ...; Schmidt-May, Ali ...; Najeeb, P. K., 1 ...; Eklund, Gustav, ...; Chartkunchand, K ...; Rosén, Stefan, 1 ...; visa fler...; Kamińska, Magdal ...; Stockett, Mark H ...; Nascimento, R.; Hansen, K.; Larson, Åsa, 197 ...; Cederquist, Henr ...; Zettergren, Henn ...; Schmidt, Henning ...; visa färre...

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