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Yusuf Hamied Department of Chemistry

 
Portrait of pbd2

Laser Spectroscopy has revolutionised the determination of molecular structure. The Cambridge Infrared Laser Spectroscopy Group uses a variety of novel laser based techniques to study molecules in situations as diverse as low pressure electric discharges (plasmas) and on surfaces buried under liquids. The shapes of short lived molecules like free radicals and ions are precisely determined using solid state diode lasers in combination with sensitive, species- specific detection methods like Velocity Modulation. Recent diode laser spectroscopy of free radicals has included measurement of the band strength of the methyl radical, CH3. This is required for detection and density measurements of CH3 in the atmospheres of the giant planets Saturn and Neptune. We are now enhancing the sensitivity of IR laser absorption spectroscopy in a fruitful collaboration with German colleagues using a Cavity Ring Down (CRD) spectrometer built around novel Quantum Cascade Lasers. The group is also heavily involved in non linear laser spectroscopy particularly the interface specific technique of Sum Frequency Generation (SFG). We use SFG to gain insight into adsorption at interfaces on a molecular scale e.g. of surfactants and polymers. We use nano and picosecond lasers for SFG in Cambridge and femtosecond SFG to quantify non linear optical effects in Langmuir Blodgett films in a joint project with co-workers in Hokkaido, Japan. The aim is eventually to use SFG to study biological systems like the lung surfactants. In addition to our international projects, which involve overseas visits by our research students, much of our work on surfaces and interfaces is strongly supported by industry.



 



 


 


 

Publications

Using Hybrid Atomic Force Microscopy and Infrared Spectroscopy (AFM-IR) to Identify Chemical Components of the Hair Medulla on the Nanoscale
AP Fellows, MTL Casford, PB Davies
– J Microsc
(2021)
jmi.13052
Orientation analysis of sum frequency generation spectra of di-chain phospholipids: Effect of the second acyl chain
AP Fellows, MTL Casford, PB Davies
– AIP Advances
(2021)
11,
045119
Nanoscale adhesion profiling and membrane characterisation in sickle cell disease using hybrid atomic force microscopy-IR spectroscopy.
AP Fellows, MTL Casford, PB Davies, JS Gibson, JN Brewin, DC Rees
– Colloids and surfaces. B, Biointerfaces
(2020)
197,
111383
Infrared Nanospectroscopy of Air-Sensitive Biological Substrates Protected by Thin Hydrogel Films
AP Fellows, MTL Casford, PB Davies
– Biophysical journal
(2020)
119,
1474
Understanding the Lubrication Mechanism of Polyvinyl Alcohol Hydrogels using Infrared Nanospectroscopy
AP Fellows, D Puhan, MTL Casford, PB Davies
– The Journal of Physical Chemistry C
(2020)
124,
18091
Thermal Behaviour of Synovene and Oleamide in Oil Adsorbed on Steel
MTL Casford, D Puhan, PB Davies, GL Bracchi, TD Smith
– Tribology Letters
(2020)
68,
52
Nanoscale Molecular Characterisation of Hair Cuticles using Integrated AFM-IR
AP Fellows, MTL Casford, PB Davies
– Applied Spectroscopy
(2020)
Nanoscale Molecular Characterisation of Hair Cuticle Cells Using Integrated Atomic Force Microscopy and Infrared Laser Spectroscopy (AFM-IR).
AP Fellows, MTL Casford, PB Davies
– Appl Spectrosc
(2020)
74,
1540
Using AFM-Nano IR Spectroscopy and Sum-Frequency Generation (SFG) Vibrational Spectroscopy to Investigate Sickle Cell Disease
AP Fellows, MTL Casford, JN Brewin, DC Rees, PB Davies, JS Gibson
– Biophysical Journal
(2020)
118,
322A
Spectral Analysis and Deconvolution of the Amide I Band of Proteins Presenting with High-Frequency Noise and Baseline Shifts
AP Fellows, M Casford, P Davies
– Applied spectroscopy
(2019)
74,
597
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Research Group

Telephone number

01223 336460

Email address

pbd2@cam.ac.uk