Diamond phase in space and the possibility of its spectroscopic detection

A.A. Shiryaev^†
Institute of Physical Chemistry and Electro Chemistry, Russian Academy of Sciences, Leninskii prosp. 31, Moscow, 119991, Russian Federation

The eventual presence of the diamond carbon allotrope in space is discussed in numerous theoretical and experimental studies. The review summarizes the principal mechanisms of nanodiamond formation and experimental results of spectroscopic and structural investigations of nano- and microdiamonds from meteorites. The size dependence of diamond spectroscopic properties is discussed. Infrared spectroscopy allows detection of C—H bonds on surfaces of hot nanodiamond grains. Spectroscopic observation of nitrogen-related point defects in nanodiamonds is very challenging; moreover, such defects have never been observed in nanodiamonds from meteorites. At the same time, photoluminescence and, eventually, absorption of some impurity-related defects, in particular, of the silicon—vacancy (SiV) center, observed in real meteoritic nanodiamonds opens the possibility of diamond detection in astronomical observations.

Keywords: diamond, nanodiamond, meteorites, interstellar dust
PACS: 61.46.−w, 78.40.−q, 81.05.ug, 95.85.Jq (all)
DOI: 10.3367/UFNe.2024.02.039656
URL: https://ufn.ru/en/articles/2024/6/b/
Scopus

2-s2.0-85200121017
ADS NASA

2024PhyU...67..561S
Citation: Shiryaev A A "Diamond phase in space and the possibility of its spectroscopic detection" Phys. Usp. 67 561–576 (2024)

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Received: 9th, June 2023, revised: 21st, February 2024, accepted: 27th, February 2024

Оригинал: Ширяев А А «Алмазная фаза углерода в космосе и возможности её обнаружения спектроскопическими методами» УФН 194 600–617 (2024); DOI: 10.3367/UFNr.2024.02.039656

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