Publications, Presentations and Inventions

My work has been extensively published with 24 papers in peer reviewed scientific journals and a chapter contributed to a book on ion trap mass spectrometry. I also hold several patents.

I have presented numerous oral and poster presentations. This includes a Keynote talk on the development of instrumentation for aviation security given at the SPIE, Orlando 2000 and Organiser and principal Chair at the ICAO (International Civil Aviation Organisation) Workshop, Sunningdale College, UK, October 1999.

I chaired the Trace and Vapour Detection Session at the Gordon Conference on Illicit Substance Detection, Connecticut, US, July 2000 and chaired the X-ray Detection session at the Gordon Conference on Drugs Detection, Oxford, July 2002. I gave an invited talk on ‘Emerging Technologies for Aviation Security’ at the IATA AvSec World 2003, Athens and a talk on the establishment of an equipment test centre by ICTS Europe at AvSec World 2005, Geneva.

More recently I gave an invited Keynote talk on radiation detection equipment at the 3rd NBC International Conference & Exhibition, Sonthofon, Germany Oct-2007, a talk on RASCargO at Dubai Airport Expo, June 2008 and was an invited speaker at the plenary session at the 2nd TSA Workshop on Trace Explosives Detection, Baltimore, April 2010.

In 2007, I acted as an expert witness in a US court case. The area of expertise was explosives detection and detection equipment.

Publications in refereed journals

The Calibration of the energy loss scale for charge stripping reactions of singly charged positive ions. M L Langford, D Mathur and F M Harris, Rap. Comm. Mass Spectrom. 2 (1988) 167.

Long lived excited states of halocarbon cations identified in high resolution charge stripping experiments. M L Langford, M Hamdan and F M Harris, Int. J. Mass Spectrom. Ion Process., 95 (1990) 243.

Experimental determination of the energies required to ionise the ions CFCl+, CFBr+, CClBr+, CF3Cl+, CF2Br+, CCl2F+, CBr2F+ and CBr2Cl2+. M L Langford and F M Harris, Int. J. Mass Spectrom. Ion Process. 96 (1990) 111.

Double electron capture in a Landau-Zener model: a reaction window. D P Almeida and M L Langford, Int. J. Mass Spectrom. Ion Process. 96 (990) 331.

Measurement of single ionisation energies or electron affinities of SFn molecules (n=1-5) using double charge transfer spectroscopy. M L Langford, D P Almeida and F M Harris. Int. J. Mass Spectrom Ion Process. 98 (1990) 147.

Evidence for a reaction window in double electron capture reactions in collisions involving the molecular target CH3Br. M L Langford and F M Harris, Rap. Comm. Mass Spectrom. 4 (1990) 125.

Triplet state energy levels of CO22+, COS2+ and CS22+. M L Langford, F M Harris, C J Reid, J A Ballentine and D E Parry, Chem. Phys. 149 (1991) 445.

Electronically excited states of C6H5F2+, C6H5Cl2+, 2-Cl-C6H4F2+, 3-Cl-C6H4F2+ and 4-Cl-C6H4F2+. W J Griffiths, M L Langford and F M Harris, Org. Mass Spectrom. 26 (1991) 917.

Double ionisation energies to ground and electronically excited singlet and triplet states of CLl42+, CCl3F2+, CCl2F22+ and CClF32+. M L Langford, F M Harris, C J Reid, J A Ballentine and D E Parry, Int. J. Mass Spectrom. Ion Process. 112 (1992) 285.

An experimental and theoretical study of the doubly charged ion O22+. J Fournier, P G Fournier, M L Langford, M Mousselmal, J M Robbe and G Gandara, J. Chem. Phys. 96 (1992) 3594.

Determination of singlet and triplet state energies of the doubly ionised ammonia molecule by double charge transfer spectroscopy. M L Langford, F M Harris, P G Fournier and J Fournier, Int. J. Mass Spectrom. and Ion Process. 116 (1992) 53.

Doubly ionised states of CH4 studied by Double-Charge-Transfer and Auger-electron Spectroscopies. W J Griffiths, S Svensson, A Naves de Brito, N Correia, M L Langford and F M Harris, Rap. Commun. Mass Spectrom. 6 (1992) 438.

Doubly ionised states of hexafluorobenzene studied by high resolution Auger electron and Double-Charge-Transfer Spectroscopies. W J Griffiths, S Svensson, A Naves de Brito, N Correia, B Wannberg, M L Langford, F M Harris, C M Liegener and H Agren, J. Chem. Soc. Faraday Trans., 89(11) (1993) 1637.

Double ionisation energies of fluorinated benzene molecules. W J Griffiths, M L Langford and F M Harris, J. Am. Chem. Soc. Mass Spectrom., 4 (1993) 513.

An experimental determination of some double-ionisation energies of carbon monoxide. M L Langford and F M Harris, Int. J. Mass Spectrom. Ion Processes, 124 (1993) 241.

Doubly ionised states of carbon tetrafluoride. W J Griffiths, S Svensson, A Naves de Brito, N Correia, M L Langford and F M Harris, Chem. Phys. 173 (1993) 109.

Singlet state energy levels of C2H42+. P G Fournier, J Fournier, M L Langford and F M Harris, accepted Chem. Phys. 1993.

Doubly ionised states of fluorinated methanes studied theoretically by means of the two particle Green's function method and experimentally by DCT and AES. W J Griffiths, M L Langford and F M Harris, J. Am. Soc. Mass Spectrom. 4 (1993) 513.

The reaction window in cross-sections for double electron capture reactions. W J Griffiths, M L Langford and F M Harris, Rapid Commun. Mass Spectrom. 10 (1996) 997.

Further thoughts on the occurrence of 'Black Holes' in ion trap mass spectrometry. F Guidugli, P Traldi, A M Franklin, M L Langford, J Murrell and J F J Todd, Rap. Comm. Mass Spectrom. 6 (1992) 229.

Negative-ion fragmentation pathways in 2,4,6-trinitrotoluene. M L Langford and J F J Todd, Organic Mass Spectrometry, 28 (1993) 773.

Investigation of ‘Ghost’ peaks caused by non-linear fields in the ion trap mass spectrometer. W Mo, M L Langford and J F J Todd, Rapid Commun. Mass Spectrom. 9 (1995) 107.

Automation of data acquisition and processing involving dynamically programmed scanning for a quadrupolar ion trap mass spectrometer. NJ Clarke, AM Franklin, ML Langford, AD Penman, DA Thorner, JFJ Todd, Rapid Communications in Mass Spectrometry Vol.9 No.9, (1995) pp 723-730

Characterisation of the positive mode ion mobility spectrometry response of 2,3-dimethyl-2,3-dinitrobutane under water, ammonia and dichloromethan reactant ion chemistries. WA Munroe, CLP Thomas and ML Langford, submitted to Anal. Chim. Acta.

Contributions to edited works:

Atmospheric glow discharge/ion trap mass spectrometry.
M L Langford and J F J Todd, Chapter 10 in "Modern Mass Spectrometry - Practical Aspects of Ion Trap Mass Spectrometry", Volume 2, Editors R E March and J F J Todd.

Reviews of academic books:

Physics of Ion Impact Phenomena
Edited by D Mathur, Chemical Physics, Springer-Verlag, 1991, 305 pp. M L Langford, Int. J.

Patents

• Radio frequency ion source, GB2311411 24-Sep-1997.
• Distorted field radio frequency ion source, US patent 5877593, 2-Mar-1999.
• Radio frequency ion source, GB2389456 12-Oct-2003.
• Radiofrequency ion source, EP1336187, 20-Oct-2003.