"Surface-Induced Dissociation of Acetone Cations from Self-Assembled Monolayer Surface of Flourinated Alkyl Thiol on Au (111) Substrate at Low Collision Energies"

Journal Article · Fri Aug 15 04:00:00 EDT 2003 · International Journal of Mass Spectrometry, 228(2-3):563-576

DOI:https://doi.org/10.1016/S1387-3806(03)00163-5· OSTI ID:15004577

Shukla, Anil K ^[1]; Futrell, Jean H ^[1]

---

1. BATTELLE (PACIFIC NW LAB)

We have studied the dissociation of acetone molecular cations to acetyl cations following collision with a monolayer surface of fluorinated alkyl thiol (FC12) self-assembled on Au (111) substrate at 13, 25.2 and 49.6 eV kinetic energies. Three energetically distinct dissociation processes contribute to total dissociation in this energy range. At all energies there is a common dissociation pathway involving loss of nearly all of the parent ions kinetic energy in the collision process. Fragment ions resulting from this dissociation mechanism are scattered over a wide range of angles. The second pathway, observed at 25.2 and 49.6 eV kinetic energy is delayed dissociation of collisionally excited acetone cations after only a small fraction of the ions kinetic energy is lost in the collision process. Fragment ions resulting from this unique dynamics feature are scattered close to the surface parallel. These dissociations take place after the excited ions have passed through the collision region and the energy analyzer and prior to their entering the mass analyzer. At 49.6 eV kinetic energy, a small intensity fragment ion peak appears at intermediate kinetic energy spectra between the low energy loss and the highly inelastic scattering peaks.

• Research Organization: Pacific Northwest National Laboratory (PNNL), Richland, WA (US)
• Sponsoring Organization: USDOE
• DOE Contract Number: AC06-76RL01830
• OSTI ID: 15004577
• Report Number(s): PNNL-SA-37835
• Journal Information: International Journal of Mass Spectrometry, 228(2-3):563-576, Journal Name: International Journal of Mass Spectrometry, 228(2-3):563-576 Journal Issue: 2-3 Vol. 228; ISSN 1387-3806
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
ACETONE
CATALYTIC EFFECTS
CHEMICAL REACTION KINETICS
DISSOCIATION
INELASTIC SCATTERING
Ion-surface collisions
Surface-Induced Dissociation
Scattering
Energy Transfer
Acetone Cations
KINETIC ENERGY
SUBSTRATES
THIOLS