High-Resolution Infrared Absorption Spectroscopy of C<sub>60</sub> Molecules and Clusters in Parahydrogen Solids

Sogoshi, Norihito; Kato, Yuichi; Wakabayashi, T.; Momose, Takamasa; Tam, Simon; DeRose, Michelle E.; Fajardo, Mario E.

doi:10.1021/jp9938718

Cited by 42 publications

(31 citation statements)

References 101 publications

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“…Cami et al (2010) used data from Martin et al (1993);Fabian (1996); Sogoshi et al (2000); for the analysis of NGC 7023 by Sellgren et al (2010), strengths from Choi et al (2000) were used. Also Iglesias-Groth et al (2011) presented molar absorptivities derived from laboratory experiments.…”

Section: J Cami Et Almentioning

confidence: 99%

Fullerenes in Circumstellar and Interstellar Environments

et al. 2011

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Abstract. We recently identified several emission bands in the Spitzer-IRS spectrum of the unusual planetary nebula Tc 1 with the infrared active vibrational modes of the neutral fullerene species C60 and C70 . Since then, the fullerene bands have been detected in a variety of sources representing circumstellar and interstellar environments. Abundance estimates suggest that C60 represents ∼0.1%-1.5% of the available carbon in those sources. The observed relative band intensities in various sources are not fully compatible with single-photon heating and fluorescent cooling, and are better reproduced by a thermal distribution at least in some sources. The observational data suggests that fullerenes form in the circumstellar environments of evolved stars, and survive in the interstellar medium. Precisely how they form is still a matter of debate.

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Section: J Cami Et Almentioning

confidence: 99%

Fullerenes in Circumstellar and Interstellar Environments

et al. 2011

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“…C 60 has four infrared-active vibrational transitions, at 7.0, 8.5, 17.4, and 18.9 μm (Frum et al 1991;Sogoshi et al 2000). We tentatively identified the 17.4 and 18.9 μm interstellar emission features in the reflection nebula NGC 7023 as due to C 60 (Werner et al 2004b;Sellgren et al 2007).…”

Section: Introductionmentioning

confidence: 80%

Confirmation of C₆₀in the Reflection Nebula NGC 7023

Sellgren

Werner

Ingalls

et al. 2011

EAS Publications Series

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Abstract. The fullerene C60 has four infrared active vibrational transitions at 7.0, 8.5, 17.5 and 18.9 μm. We have previously observed emission features at 17.4 and 18.9 μm in the reflection nebula NGC 7023 and demonstrated spatial correlations suggestive of a common origin. We now confirm the identification of these features with C60 by detecting a third emission feature at 7.04 ± 0.05 μm at a position of strong 18.9 μm emission in NGC 7023. We also report the detection of these three features in the reflection nebula NGC 2023. We show with spectroscopic mapping of NGC 7023 that the 18.9 μm feature peaks on the central star, that the 16.4 μm emission feature due to PAHs peaks between the star and a nearby photodissociation front, and that the 17.4 μm feature is a blend of a PAH feature and C60. The derived C60 abundance is consistent with that from previous upper limits and possible fullerene detections in the interstellar medium.

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“…Low-temperature (15 K) measurements of C 60 films assign the center position to 1183.7 cm −1 [23], while Ar matrix spectroscopy yields 1184.8 cm −1 [24]. Measurements in para-H 2 (p-H 2 ), considered the least perturbing matrix host, place the center position of the vibrational band at 1184.7 cm −1 [10]. Because the frequency shift between Ar and p-H 2 matrix hosts for a spectral feature is generally comparable to the frequency shift between gas-phase and p-H 2 , we feel confident 12 cm −3 .…”

Section: Vaporization Source and Expansion Seedingmentioning

confidence: 99%

“…We have simulated the 8.5 m C 60 vibrational band at high resolution, following the approach of Sogoshi et al [10]. As noted by Sogoshi et al, the appearance of the spectrum will be dependent on the change of the rotational constant from the ground to the excited vibrational state as well as the Coriolis coupling constant .…”

Section: Signal-to-noise Estimation For Cmentioning

confidence: 99%

“…The acquisition of such a spectrum would be a significant milestone in the field of molecular spectroscopy, as C 60 would be the largest and most symmetric molecule to be observed with rotational resolution. In addition, due to boson exchange symmetry restrictions on the overall symmetry of the molecular wave function there are many rotational levels in the ground and vibrationally excited state that are rigorously forbidden to exist [9,10]. Such missing levels will manifest as "gaps" in the normal progression of rovibrational lines.…”

Section: Introductionmentioning

confidence: 99%

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Inefficient Vibrational Cooling of C₆₀ in a Supersonic Expansion

Stewart

Brumfield

Gibson

et al. 2013

ISRN Physical Chemistry

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High-resolution gas-phase infrared spectroscopy of buckminsterfullerene (C 60 ) was attempted near 8.5 m using cavity ring-down spectroscopy. Solid C 60 was heated in a high-temperature (∼950 K) oven and cooled using an argon supersonic expansion generated from a 12.7 mm × 150 m slit. The expected S/N ratio is ∼140 for vibrationally cold C 60 , but no absorption signal has been observed, presumably due to a lack of vibrational cooling of C 60 in the expansion. Measurements of D 2 O at 875 K are presented as a test of instrument alignment at high temperature and show that efficient rotational cooling of D 2 O occurs in the hot oven ( rot = 20 K in the expansion), though vibrational cooling does not occur. The attempted C 60 spectroscopy is compared to previous work which showed efficient vibrational cooling of polycyclic aromatic hydrocarbons (PAHs). Possible alternative experiments for observing a cold, gas-phase spectrum of C 60 are also considered.

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High-Resolution Infrared Absorption Spectroscopy of C₆₀ Molecules and Clusters in Parahydrogen Solids

Cited by 42 publications

References 101 publications

Fullerenes in Circumstellar and Interstellar Environments

Fullerenes in Circumstellar and Interstellar Environments

Confirmation of C₆₀in the Reflection Nebula NGC 7023

Inefficient Vibrational Cooling of C₆₀ in a Supersonic Expansion

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High-Resolution Infrared Absorption Spectroscopy of C60 Molecules and Clusters in Parahydrogen Solids

Cited by 42 publications

References 101 publications

Fullerenes in Circumstellar and Interstellar Environments

Fullerenes in Circumstellar and Interstellar Environments

Confirmation of C60in the Reflection Nebula NGC 7023

Inefficient Vibrational Cooling of C60 in a Supersonic Expansion

Contact Info

Product

Resources

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High-Resolution Infrared Absorption Spectroscopy of C₆₀ Molecules and Clusters in Parahydrogen Solids

Confirmation of C₆₀in the Reflection Nebula NGC 7023

Inefficient Vibrational Cooling of C₆₀ in a Supersonic Expansion