In situ Studies of Soft- and Reactive Landing of Mass-Selected Ions Using Infrared Reflection Absorption Spectroscopy
Grazing incidence infrared reflection absorption spectroscopy (IRRAS) for in situ and in real time characterization of substrates modified by soft- and reactive landing (SL and RL) of complex ions was implemented on a mass-selected ion deposition instrument. Ions produced by electrospray ionization were mass-selected using a quadrupole mass filter and deposited onto inert and reactive self-assembled monolayer (SAM) surfaces. Surface composition during and after ion deposition was monitored using IRRAS. Physisorption of a cyclic peptide, Garmicidin S (GS), was studied for 8 hrs during deposition and additional 12 hrs after the end of deposition. The integrated signal of the characteristic amide bands followed a linear increase during the deposition and stayed unchanged after the deposition was finished. Similar linear increase in IRRAS signal was obtained following reactive deposition of the protonated dodecanediamine onto SAMs of dithiobis (succinimidyl undecanoate) (NHS-SAM) and 16-mercaptohexadecanoic acid fluoride (COF-SAM) on gold. IRRAS allowed us to monitor for the first time the formation of the amide bond between reactive SAM surfaces and the projectile molecule.
- Research Organization:
- Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 965547
- Report Number(s):
- PNNL-SA-66638; 19594; 30466; 30445; 34913; KC0302020; TRN: US200920%%330
- Journal Information:
- Analytical Chemistry, 81(17):7302-7308, Vol. 81, Issue 17
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
ABSORPTION SPECTROSCOPY
AMIDES
DEPOSITION
FLUORIDES
GOLD
IONIZATION
SUBSTRATES
PEPTIDES
SORPTION
AMINES
THIOLS
Ion soft-landing
reactive landing
surface collisions
self-assembled monolayers (SAMs)
Grazing Incidence Infrared Reflection-Absorption Spectroscopy (IRRAS)
Gramicidin S
dodecanediamine
NHS-SAM
COF-SAM
FSAM.
Environmental Molecular Sciences Laboratory