Synchrotron-based highest resolution FTIR spectroscopy of chlorobenzene

Albert, Sieghard; Keppler, Karen; Lerch, Philippe; Qüack, Martin; Wokaun, Alexander

doi:10.1016/j.jms.2015.03.004

Cited by 29 publications

(19 citation statements)

References 68 publications

(112 reference statements)

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“…An alternative approach is difference frequency generation (DFG) from cw Ti:sapphire 11,12 or diode 13 lasers, but this is accompanied by extremely low optical powers (10-100 nW range) that impair the acquisition of absorption spectra at a high signal-tonoise ratio (SNR). The limitations of laser technology have established Fourier-transform spectroscopy driven by incoherent light sources as a gold standard for the long-wavelength infrared (LWIR) region, yet not for optical metrology 14,15 and precision spectroscopy studies 16 because of the low resolution (0.0007 cm −1 or 21 MHz in the best cases 17 ) and the lack of absolute calibration for the frequency axis 18 . A powerful solution to both issues is direct comb spectroscopy 19,20 , which exploits millions of laser modes that compose the comb spectrum to directly probe molecular absorption over extremely large bands and with absolute frequency calibration 21 .…”

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confidence: 99%

Optical frequency metrology in the bending modes region

et al. 2020

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Optical metrology and high-resolution spectroscopy, despite impressive progress across diverse regions of the electromagnetic spectrum from ultraviolet to terahertz frequencies, are still severely limited in the region of vibrational bending modes from 13 to 20 µm. This long-wavelength part of the mid-infrared range remains largely unexplored due to the lack of tunable single-mode lasers. Here, we demonstrate bending modes frequency metrology in this region by employing a continuous-wave nonlinear laser source with tunability from 12.1 to 14.8 µm, optical power up to 110 µW, MHz-level linewidth and comb calibration. We assess several CO2-based frequency benchmarks with uncertainties down to 30 kHz and we provide an extensive study of the v11 band of benzene, a significant testbed for the resolution of the spectrometer. These achievements pave the way for long-wavelength infrared metrology, rotationally-resolved studies and astronomic observations of large molecules such as aromatic hydrocarbons.

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confidence: 99%

Optical frequency metrology in the bending modes region

et al. 2020

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“…Owing to the presence of ECH characteristics in microspheres, aliphatic CH stretching vibration peaks, CH bending vibration peaks, and CO stretching vibration peaks were also altered . The characteristic peaks of both Span 80 and chlorobenzene were not present in the spectra, specifically the methylene chain peak of Span 80 at 720 cm −1 and CCl stretching peak of chlorobenzene at 706 cm −1 . These results indicate that both Span 80 and chlorobenzene were successfully removed from the formulated microspheres during the washing and purification processes.…”

Section: Resultsmentioning

confidence: 95%

Preparation of Hydroxypropyl Cyclosophoraose/Dextran Microspheres for the Controlled Release of Ciprofloxacin

Lee

Jeong

Joo

et al. 2016

Bulletin Korean Chem Soc

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Hydroxypropyl cyclosophoraose/dextran (HPCys/dextran) microspheres were prepared using an emulsion polymerization method for use as drug carriers to achieve the controlled release of a poorly water‐soluble antibacterial drug, ciprofloxacin (CFX). Cyclosophoraoses are cyclic (1 → 2)‐β‐d‐glucans isolated from the Rhizobium species. Characteristics of HPCys/dextran microspheres were investigated using Fourier transform infrared analysis, solid‐state 13C nuclear magnetic resonance spectroscopy, and field emission scanning electron microscopy. The amount of CFX released from these microspheres at pH 7.4 (intestinal phase pH) was about two times higher than that released at pH 1.2 (gastric phase pH). Furthermore, HPCys/dextran microspheres did not show any toxicity in human embryonic kidney cells. We propose that HPCys/dextran microspheres could be used as an effective pH‐dependent release system for poorly water‐soluble drugs such as CFX.

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“…The absorbance between 800 and 600 cm −1 attributed to C-Cl stretching vibration absorption [15]. The appearance of C-Cl bonds at 769 cm −1 in ASC indicates that the reaction of SbCl 5 with the AC was carried out during the process of ASC preparation [16, 17]. The pore volume, average pore diameter, and surface area of AC were 0.53 cm 3 /g, 2.85 nm, and 743 m 2 /g, respectively.…”

Section: Resultsmentioning

confidence: 99%

Chemical Compositional Analysis of Catalytic Hydroconversion Products of Heishan Coal Liquefaction Residue

Yue

Zhang

et al. 2017

International Journal of Analytical Chemistry

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Liquefaction residue of Heishan bituminous coal (HLR) was subject to two hydroconversion reactions under 5 MPa initial pressure of hydrogen at 300°C for 3 h, without catalyst and with acid supported catalyst (ASC), respectively. The reaction products were analyzed with gas chromatography/mass spectrometer (GC/MS). The results show that 222 organic compounds were detected totally in the products and they can be divided into alkanes, aromatic hydrocarbons (AHCs), phenols, ketones, ethers, and other species (OSs). The yield of hydroconversion over the ASC is much higher than that without catalyst. The most abundant products are aromatic hydrocarbons in the reaction products from both catalytic and noncatalytic reactions of HLR. The yield of aromatic hydrocarbons in the reaction product from hydroconversion with the ACS is considerably higher than that from hydroconversion without a catalyst.

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Synchrotron-based highest resolution FTIR spectroscopy of chlorobenzene

Cited by 29 publications

References 68 publications

Optical frequency metrology in the bending modes region

Optical frequency metrology in the bending modes region

Preparation of Hydroxypropyl Cyclosophoraose/Dextran Microspheres for the Controlled Release of Ciprofloxacin

Chemical Compositional Analysis of Catalytic Hydroconversion Products of Heishan Coal Liquefaction Residue

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