Optical frequency comb Fourier transform spectroscopy of the CH₂⁷⁹Br⁸¹Br, CH₂⁷⁹Br₂, and CH₂⁸¹Br₂ isotopologues in the 1180–1210 cm^-1 region

Ibrahim Sadiek,* Aleksandr A. Balashov, Adrian Hjältén, Michael Rey, Oleg Egorov, Aleksandra Foltynowicz*

Physical Chemistry Chemical Physics 28 (2026) 17299

Isomer-resolved HNC/HCN chemistry in low-temperature plasmas revealed by quantum cascade laser spectroscopy

Ibrahim Sadiek,* Simona Di Bernardo, Uwe Macherius, Jean-Pierre H. van Helden

Molecular Physics (2026) e2648569

Formation of HNC and HCN isomers in molecular plasmas
revealed by frequency comb and quantum cascade laser
spectroscopy

Ibrahim Sadiek,* Simona Di Bernardo, Uwe Macherius, Jean-Pierre H. van Helden

Physical Chemistry Chemical Physics, 28 (2026) 3929

HNO dimerization as a chemical reference standard for
N₂O isotopomer ratio: Ab initio calculations, formation
kinetics, and frequency comb spectroscopy

Ibrahim Sadiek,* Adrian Hjältén, ​Gernot Friedrichs,* Aleksandra Foltynowicz

Journal of the American Chemical Society​ 147 (2025) 38110

Precision frequency comb spectroscopy of the ¹⁴N₂O, ¹⁴N¹⁵NO, ¹⁵N¹⁴NO, and ¹⁵N₂O isotopocules in the 3300-3550 cm^-1 range

Adrian Hjältén, Ibrahim Sadiek, Aleksandra Foltynowicz

Journal of Quantitative Spectroscopy and Radiative Transfer 340 (2025) 109452. 

Air-spaced virtually imaged phased array with 94 MHz resolution for precision spectroscopy

Ibrahim Sadiek,* Norbert Lang, and Jean-Pierre H. Van Helden

Optics Express 26 (2024) 46511. 

Data availability and requirements relevant for the Ariel space mission and other exoplanet atmosphere applications

Katy L. Chubb, Séverine Robert, Clara Sousa-Silva, Sergei N. Yurchenko, Nicole F. Allard, Vincent Boudon, Jeanna Buldyreva, Benjamin Bultel, Athena Coustenis, Aleksandra Foltynowicz, Iouli E. Gordon, Robert J. Hargreaves, Christiane Helling, Christian Hill, Helgi Rafn Hrodmarsson, Tijs Karman, Helena Lecoq-Molinos, Alessandra Migliorini, Michaël Rey, Cyril Richard, Ibrahim Sadiek, et al. (34 additional authors not shown)

RAS Techniques and Instruments 1 (2024) 636.

Precision spectroscopy of non-thermal molecular plasmas using mid-infrared optical frequency comb Fourier transform spectroscopy

Ibrahim Sadiek,* Alexander Puth, Grzegorz Kowzan, Akiko Nishiyama, Sarah-Johanna Klose, Jürgen Röpcke, Norbert Lang, Piotr Masłowski, Jean-Pierre H. van Helden

Plasma Sources Sccience and Technology 33 (2024) 075011.

Dual-comb Spectroscopy of Ammonia Formation in Non-thermal Plasmas

Ibrahim Sadiek,* Adam J. Fleisher, Jakob Hayden, Xinyi Huang, Andreas Hugi, Richard Engeln, Norbert Lang, Jean-Pierre H. van Helden

Communications Chemistry 7 (2024) 110.

Two species – one wavelength detection based on selective optical saturation spectroscopy

Ibrahim Sadiek, Gernot Friedrichs

Scientific Reports 13 (2023) 17098.

• Phys.org: https://phys.org/news/2024-01-optical-analysis-gases-optimized.html
• Christian-Albrechts-Universität zu Kiel: https://www.uni-kiel.de/en/details/news/001-optical-analysis-of-trace-gases
• (idw) – Informationsdienst Wissenschaft: https://idw-online.de/de/news826674
  
• Tech And Science Post: https://techandsciencepost.com/news/physics/process-for-the-optical-analysis-of-trace-gases-optimized/
  
• Chemeurope.com: https://www.chemeurope.com/en/news/1182440/process-for-the-optical-analysis-of-trace-gases-optimised.html
  
• Pro-physik: https://pro-physik.de/nachrichten/verfeinertes-verfahren-zur-optischen-analyse-von-spurengasen
  
• Analytica-world: https://www.analytica-world.com/de/news/1182440/verfahren-zur-optischen-analyse-von-spurengasen-verfeinert.html
  
• Chemie.de: https://www.chemie.de/news/1182440/verfahren-zur-optischen-analyse-von-spurengasen-verfeinert.html
  
• Aazooptics: https://www.azooptics.com/News.aspx?newsID=28560
  

Industrial surface hardening: Shining a light on process control

Mid-infrared frequency comb spectroscopy shines the way to dynamic process control of plasma nitriding.

Ibrahim Sadiek, Jaroslaw Sperling

Laser Focus World (2023).

Line positions and intensities of the ν₁ band of ¹²CH₃I using mid-infrared optical frequency comb Fourier transform spectroscopy 

Adrian Hjältén, Aleksandra Foltynowicz, Ibrahim Sadiek*

Journal of Quantitative Spectroscopy & Radiative Transfer 306 (2023) 108646.

Optical frequency comb-based measurements and the revisited assignment of high-resolution spectra of CH₂Br₂in the 2960 to 3120 cm⁻¹ region

Physical Chemistry Chemical Physics 25 (2023) 8743.

High-resolution dual-comb spectroscopy at 9.5 μm for plasma-assisted ammonia production

CLEO: Applications and Technology 2023, ATh1K.2. (Conference Proceeding).

Absolute abundance measurements of molecular species in a plasma reactor with non-uniform temperature using optical frequency comb Fourier transform spectroscopy

CLEO: Applications and Technology 2023, ATh1K.3. (Conference Proceeding).

The HITRAN2020 molecular spectroscopic database

 I.E. Gordon, L.S. Rothman, R.J. Hargreaves, R. Hashemi, E.V. Karlovets, F.M. Skinner, E.K. Conway, C. Hill, R. V. Kochanov, Y. Tan, P. Wcisło, A.A. Finenko, K. Nelson, P.F. Bernath, M. Birk, V. Boudon, A. Campargue, K.V. Chance, A. Coustenis, B.J. Drouin, J.–M. Flaud, R.R. Gamache, J.T. Hodges, D. Jacquemart, E.J. Mlawer, A.V. Nikitin, V.I. Perevalov, M. Rotger, J. Tennyson, G.C. Toon, H. Tran, V.G. Tyuterev, E.M. Adkins, A. Baker, A. Barbe, E. Canè, A. G. Császár, A. Dudaryonok, O. Egorov, A.J. Fleisher, H. Fleurbaey, A. Foltynowicz, T. Furtenbacher, J.J. Harrison, J.–M. Hartmann, V.–M. Horneman, X. Huang, T. Karman, J. Karns, S. Kassi, I. Kleiner, V. Kofman, F. Kwabia–Tchana, N.N. Lavrentieva, T.J. Lee, D.A. Long, A.A. Lukashevskaya, O.M. Lyulin, V.Y. Makhnev, W. Matt, S.T. Massie, M. Melosso, S.N. Mikhailenko, D. Mondelain, H.S.P. Müller, O.V. Naumenko, A. Perrin, O.L. Polyansky, E. Raddaoui, P.L. Raston, Z.D. Reed, M. Rey, C. Richard, R. Tóbiás, I. Sadiek, et al. (13 additional authors not shown)

Journal of Quantitative Spectroscopy & Radiative Transfer 277 (2022) 107949.

An air-spaced virtually imaged phased array spectrometer based on a mid-infrared optical frequency comb 

Ibrahim Sadiek,* Norbert Lang, Jean-Pierre H. van Helden

Optica: Optical Sensors and Sensing, 2022, LM4B. (Conference Proceeding).

Ab initio and RRKM/master equation analysis of the photolysis and thermal unimolecular decomposition of bromoacetaldehyde

Ibrahim Sadiek, Gernot Friedrichs, Yasuyuki Sakai

Jornal of Physical Chemistry A 125 (2021) 8282.

Fourier transform spectroscopy using difference frequency generation comb sources at 3.3 µm and 7.8 µm

Adrian Hjältén, Matthias Germann, Ibrahim Sadiek, Chuang Lu, Francisco Senna Vieira, Karol Krzempek, Arkadiusz Hudzikowski, Aleksander Głuszek, Dorota Tomaszewska, Michael Stuhr, Grzegorz Soboń, Aleksandra Foltynowicz

Optica: Optical Sensors and Sensing 2021, JTu4D.3. (Conference Proceeding).

High-resolution measurements of halogenated volatile organic compounds using frequency comb Fourier transform spectroscopy

Adrian Hjältén, Ibrahim Sadiek, Chuang Lu, Francisco Senna Vieira, Michael Stuhr, Matthias Germann,  Aleksandra Foltynowicz

European Quantum Electronics Conference 2021. (Conference Proceeding).

Line positions and intensities of the ν₄ band of methyl iodide using mid-infrared optical frequency comb Fourier transform spectroscopy

Ibrahim Sadiek, Adrian Hjältén, Francisco Senna Vieira, Chuang Lu, Michael Stuhr,
Aleksandra Foltynowicz

Journal of Quantitative Spectroscopy & Radiative Transfer 255 (2020) 107263.

Mid-infrared comb-based fourier transform spectroscopy of halogenated volatile organic compounds

Ibrahim Sadiek,* Adrian Hjältén, Michael Stuhr, Chuang Lu, Francisco Senna Vieira, Aleksandra Foltynowicz

CLEO: Science and Innovations, 2020, SM1M.8. (Conference Proceeding).

Towards a transferable standard for nitrous oxide isotopomer ratio

Ibrahim Sadiek, Adrian Hjältén, Michael Stuhr, Gernot Friedrichs, Aleksandra Foltynowicz

CLEO: Science and Innovations 2020, STu4N.4. (Conference Proceeding).

Optical frequency comb photoacoustic spectroscopy

Ibrahim Sadiek,* Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra Foltynowicz

CLEO: Science and Innovations 2019, SW3L.5. (Conference Proceeding).

Optical frequency comb photoacoustic spectroscopy

Ibrahim Sadiek, Tommi Mikkonen, Markku Vainio, Juha Toivonen, Aleksandra Foltynowicz

Physical Chemistry Chemical Physics 20 (2018) 27849. ( HOT Article).

Patent application: “Method for simultaneous measurement of several trace gases based on selective optical saturation spectroscopy”

Gernot Friedrichs, Ibrahim Sadiek. DE 10 2018 112 717.0 (2018).

Quantitative mid-Infrared cavity ringdown detection of methyl iodide for monitoring applications

Ibrahim Sadiek, Qiang Shi, Douglas W. R. Wallace, Gernot Friedrichs

Analytical Chemistry 89 (2017) 8445.

Doppler-limited high-resolution spectrum and VPT2 assisted assignment of the C-H stretch of CH₂Br₂

Ibrahim Sadiek, Gernot Friedrichs

Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy 181 (2017) 180.

Saturation dynamics and working limits of saturated absorption cavity ringdown spectroscopy

Ibrahim Sadiek, Grernot Friedrichs

Physical Chemistry Chemical Physics 18 (2016) 22978.

A novel nano-palladium complex anode for formic acid electro-oxidation

Gumaa A. El-Nagar, Ahmed F. Darweesh , Ibrahim Sadiek

Electrochimica Acta 215 (2016) 334.

A DFT study of the dissociation, ionization, and UV/Visible spectra of methyl hypobromite

Mohamed Elshakre, Ibrahim Sadiek

Computational and Theoretical Chemistry 1088 (2016) 334.

Enhanced electrolytic generation of oxygen gas at binary nickel oxide–cobalt oxide nanoparticle-modified electrodes

Ibrahim Sadiek, Ahmad M. Mohammad, Mohamed E. El-Shakre, Mohamed S. El-Deab, Bahgat E. El-Anadouli

Journal of Solid State Electrochemistry, 17 (2013) 871.

Electrocatalytic evolution of oxygen gas at cobalt oxide nanoparticles modified electrodes

Ibrahim Sadiek, Ahmad M. Mohammad, Mohamed E. El-Shakre, M. Ismail Awad,
Mohamed S. El-Deab, Bahgat E. El-Anadouli

International Journal of Electrochemical Science 7 (2012) 3350.

Electrocatalytic activity of nickel oxide nanoparticles-modified electrodes: Optimization of the loading level and operating pH towards the oxygen evolution reaction

Ibrahim Sadiek, Ahmad M. Mohammad, Mohammed E. El-Shakre,
Mohamed S. El-Deab

International Journal of Hydrogen Energy 37 (2012) 68.