A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC<sub>4</sub>OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

Araki, Mitsunori; Takano, Shuro; Yamabe, Hiromichi; Koshikawa, Naohiro; Tsukiyama, Koichi; Nakane, Aya; Ohteki, Toshiaki; Kunimatsu, Arisa; Kuze, Nobuhiko

doi:10.1088/0004-637x/744/2/163

Cited by 4 publications

(2 citation statements)

References 35 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although this trend was not reproduced by the chemical model, Quan et al later explained it by their new model. On the other hand, Araki et al searched for HC 4 OH in L1527 on the basis of their laboratory detection of this molecule. HC 4 OH is a unique molecule having both carbon-chain character and alcohol character.…”

Section: Observational Resultsmentioning

confidence: 99%

Warm Carbon-Chain Chemistry

2013

View full text Add to dashboard Cite

Figure 7. Velocity channel maps of CCH (N = 1−0, J = 3/2 -1/2, F = 1−1) observed with PdBI. The number at the top left corner of each panel represents the velocity. Total power data obtained with the IRAM 30 m telescope are combined to recover spatially extended components, which the interferometer cannot detect. A circle at the bottom left corner indicates a synthesized beam of the interferometric observation (3.8″ × 3.6″). Contours show every 3.9 × 10 −2 Jy beam −1 (5σ) in the first two and last two panels and every 7.7 × 10 −2 Jy beam −1 (10σ) in the others. The continuum map is overlaid in gray scale. See the caption of Figure 3 for the definition of the intensity unit. Reprinted with permission from ref 120.

show abstract

Section: Observational Resultsmentioning

confidence: 99%

Warm Carbon-Chain Chemistry

2013

View full text Add to dashboard Cite

show abstract

“…On the other hand, a few molecules in an interstellar cloud can have huge column densities compared with other molecules. For example, the column density of C 4 H in the low-mass star-forming region L1527 is 1.0 × 10 14 cm −2 (Araki et al 2012), although those of other carbon-chain molecules are 10 11 -10 13 cm −2 (Sakai et al 2008). Krełowski et al (2011) Between DIBs at 6159 and 6251 Å, the strength ratio, which might be attributed to the (Maier et al 2011, Achkasova et al 2006, Birza et al 2005, is variable in 49 clouds (Krełowski et al 2011).…”

Section: Introductionmentioning

confidence: 99%

RADIO SEARCH FOR H ₂ CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER

Araki¹,

Takano²,

Yamabe³

et al. 2012

ApJ

Self Cite

View full text Add to dashboard Cite

To clarify the authenticity of a recently proposed identification of H 2 CCC (linear-C 3 H 2 ) as a diffuse interstellar band carrier, we searched for the rotational transition of H 2 CCC at a frequency of 103 GHz toward HD 183143 using a 45-m telescope at the Nobeyama Radio Observatory. Although rms noise levels of 32 mK in the antenna temperature were achieved, detection of H 2 CCC was unsuccessful, producing a 3 σ upper limit corresponding to a column density of 2.0 × 10 13 cm −2 . The upper limit indicates that the contribution of H 2 CCC to the diffuse interstellar band at 5450 Å is less than 1/25; thus, it is unlikely that the laboratory bands of the B 1 B 1 -X 1 A 1 transition of H 2 CCC and the diffuse interstellar bands at 5450 Å (and also 4881 Å) toward HD 183143 are related.

show abstract

Even–odd product variation of the C_n⁺ + D₂ (n = 4–9) reaction: complexity of the linear carbon cation electronic states

Koyasu

Ohtaki

Ying.-Bing.

et al. 2015

Phys. Chem. Chem. Phys.

View full text Add to dashboard Cite

We have studied reactions between linear Cn(+) (n = 4-9) and D2, using ion mobility mass spectrometry techniques and quantum chemical calculations in order to understand the complex reactivity of the linear cluster cations. Only linear CnD(+) products were observed for the odd (n = 5, 7, 9) linear clusters, while CnD2(+) was the main product for the even clusters. For the reaction rate constants determined for these two channels, we obtained the following two features: (1) the rate constant decreases with the size n, and (2) even-sized clusters have lower rate constants than neighboring odd-sized clusters. In the theoretical calculations using the CCSD(T) and B3LYP methods with the cc-pVTZ basis, we found that a low lying (2)Σ state in odd clusters may play an important role in these reactions. This opposes the previous interpretation that the (2)Πg/u state is the dominant electronic state for linear Cn(+) (n = 4-9) clusters. We showed that a barrierless radical abstraction forming CnD(+) occurs through a direct head on approach for the (2)Σ state Cn(+). In contrast, a carbene-like insertion forming CnD2(+) occurs through a sideways approach for the (2)Πg/u state Cn(+). We have concluded that the higher rate constants for the odd clusters come from the existence of symmetry broken (2)Σ states which are absent in even linear clusters.

show abstract

A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC₄OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

Cited by 4 publications

References 35 publications

Warm Carbon-Chain Chemistry

Warm Carbon-Chain Chemistry

RADIO SEARCH FOR H ₂ CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER

Even–odd product variation of the C_n⁺ + D₂ (n = 4–9) reaction: complexity of the linear carbon cation electronic states

Contact Info

Product

Resources

About

A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC4OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

Cited by 4 publications

References 35 publications

Warm Carbon-Chain Chemistry

Warm Carbon-Chain Chemistry

RADIO SEARCH FOR H 2 CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER

Even–odd product variation of the Cn+ + D2 (n = 4–9) reaction: complexity of the linear carbon cation electronic states

Contact Info

Product

Resources

About

A SEARCH FOR INTERSTELLAR CARBON-CHAIN ALCOHOL HC₄OH IN STAR-FORMING REGION L1527 AND DARK CLOUD TMC-1

RADIO SEARCH FOR H ₂ CCC TOWARD HD 183143 AS A CANDIDATE FOR A DIFFUSE INTERSTELLAR BAND CARRIER

Even–odd product variation of the C_n⁺ + D₂ (n = 4–9) reaction: complexity of the linear carbon cation electronic states