The rotational spectrum of ozone

Gora, Edwin K.

doi:10.1016/0022-2852(59)90009-8

Cited by 50 publications

(4 citation statements)

References 8 publications

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“…10), and therefore does not originate from the source. We attribute it to atmospheric ozone emission (Gora 1959). We also detect a weaker but still intense feature at 23.87 GHz, in both on and off-source spectra (see Fig.…”

Section: Final Reduced Spectrummentioning

confidence: 59%

Search for polycyclic aromatic hydrocarbons in the Perseus molecular cloud with the Green Bank Telescope

Ali-Haı̈moud

Pérez

Maddalena

et al. 2014

Monthly Notices of the Royal Astronomical Society

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Polycyclic Aromatic Hydrocarbons (PAHs) are believed to be the small-size tail of the interstellar carbonaceous dust grain population. Their vibrational emission is the most widely accepted source of the aromatic near-infrared features, and their rotational radiation is a likely explanation for the dust-correlated anomalous microwave emission (AME). Yet, no individual interstellar PAH molecule has been identified to date. It was recently recognised that quasi-symmetric planar PAHs ought to have a well identifiable comb-like rotational spectrum, and suggested to search for them in spectroscopic data with matched-filtering techniques. We report the results of the first such search, carried out with the Green Bank Telescope, and targeting the star-forming region IC348 in the Perseus molecular cloud, a known source of AME. Our observations amounted to 16.75 hours and spanned a 3 GHz-wide band extending from 23.3 to 26.3 GHz. Using frequency switching, we achieved a sensitivity of 0.4 mJy per 0.4 MHz channel (1σ). The non-detection of comb-like spectra allowed us to set upper bounds on the abundance of specific quasi-symmetric PAH molecules (specified uniquely by their moments of inertia) of approximately 0.1% of the total PAH abundance. This bound generically applies to PAHs with approximately 15 to 100 carbon atoms.

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Section: Final Reduced Spectrummentioning

confidence: 59%

Search for polycyclic aromatic hydrocarbons in the Perseus molecular cloud with the Green Bank Telescope

Ali-Haı̈moud

Pérez

Maddalena

et al. 2014

Monthly Notices of the Royal Astronomical Society

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“…Previously unreported 13 C lines and spectroscopic parameters for ap-MACR and trans-isoprene are summarized in the ESI, † and additional work is underway to characterize gauche-isoprene from these buffer gas experiments. 34 and a number of isoprene peaks. 35 The experimental conditions are chosen such that primary chemistry is dominant, as opposed to secondary chemistry such as oxidation of MVK or MACR.…”

Section: Methodsmentioning

confidence: 99%

The ozonolysis of isoprene in a cryogenic buffer gas cell by high resolution microwave spectroscopy

Porterfield

Eibenberger

Patterson

et al. 2018

Phys. Chem. Chem. Phys.

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We have developed a method to quantify reaction product ratios using high resolution microwave spectroscopy in a cryogenic buffer gas cell. We demonstrate the power of this method with the study of the ozonolysis of isoprene, CH2[double bond, length as m-dash]C(CH3)-CH[double bond, length as m-dash]CH2, the most abundant, non-methane hydrocarbon emitted into the atmosphere by vegetation. Isoprene is an asymmetric diene, and reacts with O3 at the 1,2 position to produce methyl vinyl ketone (MVK), formaldehyde, and a pair of carbonyl oxides: [CH3CO-CH[double bond, length as m-dash]CH2 + CH2[double bond, length as m-dash]OO] + [CH2[double bond, length as m-dash]O + CH3COO-CH[double bond, length as m-dash]CH2]. Alternatively, O3 could attack at the 3,4 position to produce methacrolein (MACR), formaldehyde, and two carbonyl oxides [CH2[double bond, length as m-dash]C(CH3)-CHO + CH2[double bond, length as m-dash]OO] + [CH2[double bond, length as m-dash]O + CH2[double bond, length as m-dash]C(CH3)-CHOO]. Purified O3 and isoprene were mixed for approximately 10 seconds under dilute (1.5-4% in argon) continuous flow conditions in an alumina tube held at 298 K and 5 Torr. Products exiting the tube were rapidly slowed and cooled within the buffer gas cell by collisions with cryogenic (4-7 K) He. High resolution chirped pulse microwave detection between 12 and 26 GHz was used to achieve highly sensitive (ppb scale), isomer-specific product quantification. We observed a ratio of MACR to MVK of 2.1 ± 0.4 under 1 : 1 ozone to isoprene conditions and 2.1 ± 0.2 under 2 : 1 ozone to isoprene conditions, a finding which is consistent with previous experimental results. Additionally, we discuss relative quantities of formic acid (HCOOH), an isomer of CH2[double bond, length as m-dash]OO, and formaldehyde (CH2[double bond, length as m-dash]O) under varying experimental conditions, and characterize the spectroscopic parameters of the singly-substituted 13C trans-isoprene and 13C anti-periplanar-methacrolein species. This work has the potential to be extended towards a complete branching ratio analysis, as well towards the ability to isolate, identify, and quantify new reactive intermediates in the ozonolysis of alkenes.

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“…The rotational spectrum of ozone is described by Gora (1959), Trambarulo, et al (1953 and Lichtenstein and Gallagher (1970). A strong complex spectrum starts a lower frequency of 9201 MHz and extends to the infrared region.…”

Section: Comentioning

confidence: 99%

Remote sensing of the troposphere

Zissis¹

1974

Remote Sensing of Environment

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The rotational spectrum of ozone

Cited by 50 publications

References 8 publications

Search for polycyclic aromatic hydrocarbons in the Perseus molecular cloud with the Green Bank Telescope

Search for polycyclic aromatic hydrocarbons in the Perseus molecular cloud with the Green Bank Telescope

The ozonolysis of isoprene in a cryogenic buffer gas cell by high resolution microwave spectroscopy

Remote sensing of the troposphere

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