Terahertz Time Domain Gas-phase Spectroscopy of Carbon Monoxide

Kilcullen, Patrick; Hartley, Ian D.; Jensen, E. T.; Reid, M.

doi:10.1007/s10762-014-0139-z

Cited by 18 publications

(7 citation statements)

References 12 publications

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“…It is worthwhile to note that our initial studies with the model treated all of the parameters as fitted parameters, which resulted in the pressure P and temperature T settling to the values seen in the experiment and the remaining parameters settling to their literature values. We then lessened the computational complexity by fitting only the pressure P and temperature T. In doing so, we recognize that the effects of water vapour are defined specifically by its partial pressure, to allow for variations in both humidity and total pressure P. However, the forthcoming analyses will consider only a fixed humidity (at approximately 30%) and fitted total pressure P. Additional details on partial pressures and their influence on the collisional time constant 1/Δω J can be found in our previous work 7 and other studies. 8 Ultimately, all of the parameters are used to calculate the intermediate results from Eqs.…”

Section: Theoretical Modelmentioning

confidence: 99%

Mitigating the effects of water vapour absorption within terahertz wireless communication systems

Mohamed,

Guidi,

Reid

et al. 2024

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII

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Communication technology has shown trends towards wireless systems (for improved mobility) and broader bandwidths (for high data rates). This has led to growing interest in terahertz (THz) wireless communication systems-for which there are great benefits and equally great challenges. Arguably, the single greatest challenge for THz wireless communication systems is the susceptibility of the THz spectrum to water vapour absorption in the free-space/air environment. Our study recognizes this challenge and introduces a physical model through which the water vapour characteristics can be fit and then removed from measured signal characteristics. We show the physical foundations of our model and demonstrate its effectiveness in fitting the water vapour characteristics in measured signals from a THz time-domain spectroscopy system. The theoretical and experimental results show strong agreement, suggesting that the model can be an effective tool for characterizing and mitigating the effects of water vapour absorption in future THz wireless communication systems.

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Section: Theoretical Modelmentioning

confidence: 99%

Mitigating the effects of water vapour absorption within terahertz wireless communication systems

Mohamed,

Guidi,

Reid

et al. 2024

Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications XVII

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“…THz spectroscopy in both frequency and time domain have been also applied for tracing gases. THz spectral signatures for example in hydrogen cyanide (HCN) [153,154], carbon monoxide (CO) [155,156], formaldehyde (H 2 CO) [157,158], and water (H 2 O) [159,160] allow to identify and quantify the individual gases from the pure rotational transitions.…”

Section: Molecular Dynamics Structural Biology and Bio-medical Applic...mentioning

confidence: 99%

Multi-Pass Free Electron Laser Assisted Spectral and Imaging Applications in the Terahertz/Far-IR Range Using the Future Superconducting Electron Source BriXSinO

et al. 2022

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Free-Electron Lasers are a rapidly growing field for advanced science and applications, and worldwide facilities for intense field generation, characterization and usage are becoming increasingly popular due to their peculiarities, including extremely bright, coherent, wide band tunable ultra-short pulses which are not achievable with other techniques up to now. In this review we give a thorough survey of the latest advances in the Free-Electron Laser-based field generation and detection methodologies and then present the main characteristics of a future THz/IR source, named TerRa@BriXSinO, based on a superconducting linear accelerator. The foreseen source is strongly monochromatic, with a bandwidth of 1% or smaller, highly coherent both transversally and longitudinally, with extreme versatility and high frequency tunability. After introducing the most recent and novel FEL-assisted scientific investigations, including fundamental explorations into complex systems and time-dependent interactions and material dynamics, we present our vision on the potential use of the TerRa facility and analyze some possible applications, ranging from non-linear physics under extreme conditions to polarization sensitive imaging and metamaterial-based sensing.

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“…THz/F-IR time-domain spectroscopy can combine the generation of a THz/F-IR pulse in a zinc telluride crystal via opto-electronic rectification or from plasma filamentation in air using (in both cases) a femtosecond laser with a delay line and opto-electronic detection method in order to record the time domain trace (Allodi et al, 2013). This kind of spectroscopy has been widely used for gas-phase spectral line characterization in vacuum chambers (Kilcullen et al, 2015), in the study of refractive indices (Giuliano et al, 2019), and in the study of intermolecular transitions in astrophysical ice analogues, where the THz/F-IR signal is reflected by or transmitted through the gas or ice. Although it is able to provide critical information regarding the frequency of the spectral transition and the absorption coefficient, it does have a few disadvantages including slow acquisition times and a fine-tuning requirement (Trofimov and Varentsova 2016).…”

Section: Spectrometer and Detector Technologymentioning

confidence: 99%

The Role of Terahertz and Far-IR Spectroscopy in Understanding the Formation and Evolution of Interstellar Prebiotic Molecules

Mifsud

Hailey

Muiña

et al. 2021

Front. Astron. Space Sci.

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Stellar systems are often formed through the collapse of dense molecular clouds which, in turn, return copious amounts of atomic and molecular material to the interstellar medium. An in-depth understanding of chemical evolution during this cyclic interaction between the stars and the interstellar medium is at the heart of astrochemistry. Systematic chemical composition changes as interstellar clouds evolve from the diffuse stage to dense, quiescent molecular clouds to star-forming regions and proto-planetary disks further enrich the molecular diversity leading to the evolution of ever more complex molecules. In particular, the icy mantles formed on interstellar dust grains and their irradiation are thought to be the origin of many of the observed molecules, including those that are deemed to be “prebiotic”; that is those molecules necessary for the origin of life. This review will discuss both observational (e.g., ALMA, SOFIA, Herschel) and laboratory investigations using terahertz and far-IR (THz/F-IR) spectroscopy, as well as centimeter and millimeter spectroscopies, and the role that they play in contributing to our understanding of the formation of prebiotic molecules. Mid-IR spectroscopy has typically been the primary tool used in laboratory studies, particularly those concerned with interstellar ice analogues. However, THz/F-IR spectroscopy offers an additional and complementary approach in that it provides the ability to investigate intermolecular interactions compared to the intramolecular modes available in the mid-IR. THz/F-IR spectroscopy is still somewhat under-utilized, but with the additional capability it brings, its popularity is likely to significantly increase in the near future. This review will discuss the strengths and limitations of such methods, and will also provide some suggestions on future research areas that should be pursued in the coming decade exploiting both space-borne and laboratory facilities.

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Terahertz Time Domain Gas-phase Spectroscopy of Carbon Monoxide

Cited by 18 publications

References 12 publications

Mitigating the effects of water vapour absorption within terahertz wireless communication systems

Mitigating the effects of water vapour absorption within terahertz wireless communication systems

Multi-Pass Free Electron Laser Assisted Spectral and Imaging Applications in the Terahertz/Far-IR Range Using the Future Superconducting Electron Source BriXSinO

The Role of Terahertz and Far-IR Spectroscopy in Understanding the Formation and Evolution of Interstellar Prebiotic Molecules

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