A chirped pulse Fourier transform microwave study of the refrigerant alternative 2,3,3,3-tetrafluoropropene

Marshall, Mark D.; Leung, Helen O.; Scheetz, Benjamin Q.; Thaler, Jonathan E.; Muenter, J. S.

doi:10.1016/j.jms.2011.02.005

Cited by 34 publications

(30 citation statements)

References 26 publications

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“…8 The signal-to-noise of the instrument in both the DDS and AWG configurations is lower than the original Pate lab spectrometer, 8 due to the polarization power available (50 W versus 2 kW), but comparable to other low power (<100 W) CP-FTMW spectrometers. 9,11,13,23,25 …”

Section: B Phase Stability and Signal-to-noise Of The Fidmentioning

confidence: 99%

“…26 After 22 h of averaging at a 2.1 kHz repetition rate (170 million averages) the signal-to-noise of the strongest peak was ∼18 000:1. The dual sideband convolved (LO = 11 900 MHz) predicted spectrum of the normal species of acetone 27,28 and the two 13 C substituted species 29 (scaled to 1% intensity) at 2 K are also plotted in Figure 5, with negative intensity. At this sensitivity, the singly substituted 13 C isotopomer of acetone is clearly visible in natural abundance at 160:1, as shown in the inset of Figure 5.…”

Section: Full Instrument Demonstrationmentioning

confidence: 99%

“…8 The fast acquisition speed of the DDS CP-FTMW spectrometer is demonstrated in Figure 6. After 30 s of data collection (65 000 averages) two of the the strongest peaks of the carbonyl substituted 13 C isotopomer are visible at 3:1 signalto-noise.…”

Section: Full Instrument Demonstrationmentioning

confidence: 99%

“…8 The bandwidth, acquisition speed, sensitivity, and relative intensity information attainable with the chirped pulse design has led to its increasingly widespread use in the molecular spectroscopy community. [9][10][11][12][13][14][15][16] There are three major components of CP-FTMW spectrometers that enable the collection of broadband spectra: high sample rate digitizers for acquisition of the microwave emission, broadband high power amplifiers (based on either solid state or traveling wave tube technology) to ensure sufficient power for sample polarization, and Arbitrary Waveform Generators (AWGs) or Arbitrary Function Generators (AFGs) for producing the chirped polarization pulse. In state-of-the-art, multi-GHz bandwidth instruments each of these major components require significant power and physical space.…”

Section: Introductionmentioning

confidence: 99%

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A direct digital synthesis chirped pulse Fourier transform microwave spectrometer

Finneran

Holland

Carroll

et al. 2013

Review of Scientific Instruments

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Chirped pulse Fourier transform microwave (CP-FTMW) spectrometers have become the instrument of choice for acquiring rotational spectra, due to their high sensitivity, fast acquisition rate, and large bandwidth. Here we present the design and capabilities of a recently constructed CP-FTMW spectrometer using direct digital synthesis (DDS) as a new method for chirped pulse generation, through both a suite of extensive microwave characterizations and deep averaging of the 10-14 GHz spectrum of jet-cooled acetone. The use of DDS is more suited for in situ applications of CP-FTMW spectroscopy, as it reduces the size, weight, and power consumption of the chirp generation segment of the spectrometer all by more than an order of magnitude, while matching the performance of traditional designs. The performance of the instrument was further improved by the use of a high speed digitizer with dedicated signal averaging electronics, which facilitates a data acquisition rate of 2.1 kHz.

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Section: B Phase Stability and Signal-to-noise Of The Fidmentioning

confidence: 99%

Section: Full Instrument Demonstrationmentioning

confidence: 99%

Section: Full Instrument Demonstrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A direct digital synthesis chirped pulse Fourier transform microwave spectrometer

Finneran

Holland

Carroll

et al. 2013

Review of Scientific Instruments

View full text Add to dashboard Cite

show abstract

“…Some examples are the spectrometers developed at Amherst [15] and Manitoba [16] (both 6 GHz bandwidth), North Texas [17,18] (2 GHz bandwidth), and Eastern Illinois [19] (two overlapped 230 MHz sidebands).…”

Section: Introductionmentioning

confidence: 99%

Identification of Trace 2-Chloropropene with a New Chirped Pulse Microwave Spectrometer

Kisiel

Kosarzewski

2017

Acta Phys. Pol. A

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The design of a new chirped pulse, Fourier-transform microwave spectrometer for recording broadband rotational spectra of supersonic expansion samples is described. The spectrometer can record spectral windows of width of up to 2.2 GHz over the 2-18 GHz frequency region. It is complemented by a new FFT program with several novel features. Tests of the spectrometer revealed the presence of an initially unknown volatile trace molecule in a sample of 2,2-dichloropropane (DCP). The broadband nature of the new spectrometer allowed rapid assignment of the new species as 2-chloropropene, CH3CCl=CH2 (2CP). Additional mm wave measurements combined with analysis of previous DCP spectra up to 311 GHz allow us to report the hitherto most precise spectroscopic constants for 2CP.

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Analysis of isomeric mixtures by molecular rotational resonance spectroscopy

Neill

Evangelisti

Pate

2023

Analytical Science Advances

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Recent developments in molecular rotational resonance (MRR) spectroscopy that have enabled its use as an analytical technique for the precise determination of molecular structure are reviewed. In particular, its use in the differentiation of isomeric compounds—including regioisomers, stereoisomers and isotopic variants—is discussed. When a mixture of isomers, such as resulting from a chemical reaction, is analyzed, it is highly desired to be able to unambiguously identify the structures of each of the components present, as well as quantify them, without requiring complex sample preparation or reference standards. MRR offers unique capabilities for addressing this analytical challenge, owing to two factors: its high sensitivity to a molecule's structure and its high spectral resolution, allowing mixtures to be resolved without separation of components. This review introduces core theoretical principles, an introduction to MRR instrumentation and the methods by which spectra can be interpreted with the aid of computational chemistry to correlate the observed patterns to molecular structures. Recent articles are discussed in which this technique was applied to help chemists complete challenging isomer analyses. Developments in the use of MRR for chiral analysis and in the measurement of isotopically labeled compounds are also highlighted.

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A chirped pulse Fourier transform microwave study of the refrigerant alternative 2,3,3,3-tetrafluoropropene

Cited by 34 publications

References 26 publications

A direct digital synthesis chirped pulse Fourier transform microwave spectrometer

A direct digital synthesis chirped pulse Fourier transform microwave spectrometer

Identification of Trace 2-Chloropropene with a New Chirped Pulse Microwave Spectrometer

Analysis of isomeric mixtures by molecular rotational resonance spectroscopy

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