Evidence for Chain Molecules Enriched in Carbon, Hydrogen, and Oxygen in Comet Halley

@article{Mitchell1987EvidenceFC,
  title={Evidence for Chain Molecules Enriched in Carbon, Hydrogen, and Oxygen in Comet Halley},
  author={David L. Mitchell and Robert P. Lin and Kinsey A. Anderson and Charles W. Carlson and David W. Curtis and Axel Korth and H. R�ME and J. A. Sauvaud and C. d'Uston and D. Asoka Mendis},
  journal={Science},
  year={1987},
  volume={237},
  pages={626 - 628}
}
In situ measurements of the composition and spatial distribution of heavy thermal positive ions in the coma of comet Halley were made with the heavy-ion analyzer RPA2-PICCA aboard the Giotto spacecraft. Above 50 atomic mass units an ordered series of mass peaks centered at 61, 75, 91, and 105 atomic mass units were observed. Each peak appears to be composed of three or more closely spaced masses. The abundances decrease and the dissociation rates increase smoothly with increasing mass. These… 
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References

SHOWING 1-10 OF 12 REFERENCES
In situ gas and ion measurements at comet Halley
The neutral mass spectrometer experiment (NMS) carried by the Giotto spacecraft was designed to determine the abundances and the chemical, elemental and isotopic composition of the gases and
First Polymer in Space Identified in Comet Halley
The heavy-ion mass spectrum obtained in the inner coma of comet Halley with the PICCA instrument on the Giotto spacecraft has been examined. Short polymer chains of polyoxymethylene and their decay
Ion composition and dynamics at comet Halley
The ion mass spectrometer aboard the Giotto spacecraft measured the composition and velocity distributions of cometary ions at distances of ∼7.5×l06 to ∼1,300 km from the nucleus of comet Halley.
Cyanogen jets in comet Halley
Current theory holds that jets, spirals and other detailed features in cometary comae are visible only in the continuum reflected by the dust particles. It has generally been thought that these
Composition of comet Halley dust particles from Vega observations
The dust impact mass analyser (PUMA) carried by the spacecraft Vega 1 and Vega 2 has provided the first direct measurements of the physical and chemical properties of cometary dust. Particles of mass
Quantum Low-Temperature Limit of a Chemical Reaction Rate
TLDR
A low-temperature limit to a chemical reaction rate has been observed in the solid state of formaldehyde, interpreted as a quantum effect caused by tunneling from the zero vibration level of the initial state, and a semiquantitative theory is given.
Composition of cometary dust: The case against silicates
It is argued that the infrared emission including 10 and 18 μ features observed in recent comets is unlikely to be due to silicates. The vaporization temperature of the emitting material ∼500 K is
THE NATURE OF THE COMETARY NUCLEUS
The basic properties of the cometary nucleus are reviewed. Consideration is given to the absence of depth differentiation, the icy conglomerate nature, the possible existence of a halo of icy grains
erg, a human ets-related gene on chromosome 21: alternative splicing, polyadenylation, and translation.
TLDR
It is proposed thatAlternative sites of splicing and polyadenylation, together with alternative sites of translation initiation, allow the synthesis of two related polypeptides from a single erg gene transcriptional unit.
Pheromone Components and Active Spaces: What Do Moths Smell and Where Do They Smell It?
TLDR
Results support the alternative hypothesis that the active space of a multicomponent pheromone is a function of male perception of the female-released blend of components, rather than of the major component alone, and that so-called minor components have a greater impact on male behavior farther downwind of a female than previously thought.
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