Energy Transfer in Collisions of Peptide Ions with Surfaces
Time- and energy-resolved surface induced (SID) dissociation of a singly protonated octapeptide des-Arg1-bradykinin (PPGFSPFR) was used to study the effect of physical properties of the SID target on the efficiency of translational to vibrational energy transfer (T > V) in collisions of peptide ions with surfaces. Four SID targets of varying chemical composition and stiffness were examined in this work: self-assembled monolayers of 1-dodecane thiol (HSAM) and its fluorinated analog (CF3(CF2)9C2H4SH - FSAM) on gold, a 300 nm thick layer of lithium fluoride (LiF) on a polished titanium surface, and a 2 m carbon vapor deposited diamond layer on a titanium surface. An RRKM-based modeling approach was utilized to extract internal energy distributions deposited into the precursor ion upon collisions with different surfaces. We found that the percent of T -> V transfer increases in the order: HSAM (10.1%), LiF (12.0%), diamond (19.2%), FSAM (20.5%). Furthermore, the width of the energy deposition function (EDF) is affected by the properties of the SID target. Collisions of peptide ions with the HSAM surface results in deposition of relatively narrow internal energy distributions with the width of the EDF increasing in the order: HSAM < FSAM < LiF < Diamond. The results demonstrate that surface stiffness has a major effect on the width of the EDF, while the average energy deposited into the ion is mainly affected by the mass of the chemical moiety representing an immediate collision partner for the ion impacting the surface.
- Research Organization:
- Pacific Northwest National Lab., Richland, WA (US), Environmental Molecular Sciences Laboratory (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC06-76RL01830
- OSTI ID:
- 15004346
- Report Number(s):
- PNNL-SA-38045; JCPSA6; 6291; KC0302010; TRN: US201015%%544
- Journal Information:
- Journal of Chemical Physics, Vol. 119, Issue 6; Other Information: PBD: 8 Aug 2003; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
CARBON
CHEMICAL COMPOSITION
DEPOSITION
DIAMONDS
DISSOCIATION
EFFICIENCY
ENERGY SPECTRA
ENERGY TRANSFER
FLEXIBILITY
GOLD
LITHIUM FLUORIDES
PEPTIDES
PHYSICAL PROPERTIES
PRECURSOR
TARGETS
THIOLS
TITANIUM
ENVIRONMENTAL MOLECULAR SCIENCES LABORATORY
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