The CaO orange system in meteor spectra

Berezhnoy, A. A.; Borovička, J.; Santos, Jonathan; Rivas-Silva, J.F.; Sandoval, L.; Stolyarov, A. V.; Palma, A.

doi:10.1016/j.pss.2017.10.007

Cited by 20 publications

(12 citation statements)

References 20 publications

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“…In addition the ExoMol database has been used to support a variety of other studies. Examples including the analysis of gaseous ammonia in Jupiter [34] , tentative detection of H 2 S in Uranus [35] , detection of CaO in meteors [36] and SiO in B[e] Supergiants [37] , Late-type stars [38] or circumstellar environment [39] . Detections in the atmospheres of exoplanets are discussed below.…”

Section: Introductionmentioning

confidence: 99%

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

Tennyson

Yurchenko

Al-Refaie

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

192

161

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The ExoMol database ( www.exomol.com ) provides molecular data for spectroscopic studies of hot atmospheres. While the data are intended for studies of exoplanets and other astronomical bodies, the dataset is widely applicable. The basic form of the database is extensive line lists; these are supplemented with partition functions, state lifetimes, cooling functions, Landé g-factors, temperature-dependent cross sections, opacities, pressure broadening parameters, k -coefficients and dipoles. This paper presents the latest release of the database which has been expanded to consider 80 molecules and 190 isotopologues totaling over 700 billion transitions. While the spectroscopic data are concentrated at infrared and visible wavelengths, ultraviolet transitions are being increasingly considered in response to requests from observers. The core of the database comes from the ExoMol project which primarily uses theoretical methods, albeit usually fine-tuned to reproduce laboratory spectra, to generate very extensive line lists for studies of hot bodies. The data have recently been supplemented by line lists derived from direct laboratory observations, albeit usually with the use of ab initio transition intensities. A major push in the new release is towards accurate characterisation of transition frequencies for use in high resolution studies of exoplanets and other bodies.

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Section: Introductionmentioning

confidence: 99%

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

Tennyson

Yurchenko

Al-Refaie

et al. 2020

Journal of Quantitative Spectroscopy and Radiative Transfer

192

161

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“…The success of the CaO line list (Yurchenko et al 2016c) in a spectrum assignment at 29 km above the Earth's surface by Berezhnoy et al (2018) is indicative of potential importance of s-block metal monoxides like NaO. NaO similarly is a molecule that can be studied in a terrestrial environment at approximately 90 km above the Earth's surface (Slanger et al 2005) and has been recently studied as a transient species in airglow by Sarkhel et al (2009Sarkhel et al ( , 2010 and Plane et al (2012).…”

Section: Discussionmentioning

confidence: 99%

“…Finally, a rovibronic line list for NaO is simulated to be suitable for modeling spectra up to temperature 2500 K. This line list is constructed as part of the ExoMol project (Tennyson & Yurchenko 2012). We note that a previous ExoMol line list for CaO (Yurchenko et al 2016b), constructed using similar methodology to that employed here, was used by Berezhnoy et al (2018) to assign a spectrum of CaO in the wake of the Beneshov bolide at the height of 29 km above the Earth's surface.…”

Section: Introductionmentioning

confidence: 99%

ExoMol molecular line lists -- XLIII: Rovibronic molecular line list the low-lying two states of NaO

Mitev¹,

Taylor²,

Tennyson³

et al. 2021

Preprint

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The sodium monoxide radical (NaO) is observed in night glow in the Earth's mesosphere and likely has astronomical importance. This study concerns the optical transitions within the ground X 2 Π state and to the very low-lying (𝑇 e ≈ 2000 cm −1 ) excited A 2 Σ + state. A line list consisting of rovibronic term values, allowed electric dipole transitions, Einstein coefficients, and partition functions for varying temperature are produced due to a variational solution of the coupled-channel Schrödinger equations using the program D . MRCI ab initio calculations characterising the potential energy curves of the both states, spin-orbit and 𝐿-uncoupling non-adiabatic matrix elements, as well as permanent and transition dipole moments were integral in formation of the final deperturbation model. Ab initio potential energy curves are represented in the analytical Extended-Morse-Oscillator form and refined, along with the spin-orbit and 𝐿-uncoupling functions, by least-squares fitting to the available spectroscopic data. The input experimental data consisted of pure rotational transitions within the fine structure components of the X 2 Π state for 𝑣 ∈ [0, 3] vibrational levels as well as the rovibronic A 2 Σ + (𝑣 = 0) ← X 2 Π(𝑣 = 0) transitions, both with limited coverage over rotational excitation. The lack of data detailing the vibrational structure of the X and A states prompts a request for further experimental study of higher excited levels which would provide a robust spectroscopic model. The NaO NaOUCMe line list is available via www.exomol.com and the CDS database.

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“…Лабутин Одним из направлений использования лазерной плазмы является лабораторное моделирование процесса сгорания метеоров в верхних слоях атмосферы. Кальций входит в состав многих объектов космического происхождения, в частности, спектр кальция и молекулярные полосы CaO наблюдали в спектре метеора Бенешов [14]. Особенностью лазерно индуцированной плазмы на твердой мишени является наличие большого количества мелкодисперсных частиц, выносимых с поверхности пробы в результате взрывного кипения, поэтому наблюдается интенсивное Ми-рассеяние, исключающее возбуждение и регистрацию флуоресценции на одной длине волны.…”

Section: Introductionunclassified

Наблюдение Атомной Флуоресценции Кальция В Лазерно Индуцированной Плазме С Высоким Пространственным Разрешением

Бегларян¹,

Zakuskin²,

Лабутин³

2022

Оптика И Спектроскопия

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Определены экспериментальные параметры, оптимальные для изучения распределения атомов кальция в лазерно индуцированной плазме при пониженном давлении (16 Torr) методом атомной флуоресценции. Для возбуждения и наблюдения флуоресценции была впервые предложена и реализована схема нерезонансной флуоресценции с использованием переходов между состояниями 4s4p(3Po)-4p2(3P) с длинами волн 428.30 и 430.25 nm соответственно. На основании анализа влияния прогорания мишени на интенсивность сигнала флуоресценции и сравнения кривых насыщения флуоресценции показано, что для наблюдения флуоресценции предпочтительно использовать мишень из чистого карбоната кальция. Существенное (в 62 раза) усиление сигнала при наблюдении флуоресценции в оптимальных условиях позволяет пренебречь вкладом спонтанной эмиссии в интенсивность линий. Также показано малое влияние температуры в пределах, наблюдаемых в диагностируемой лазерной плазме, на заселенность используемого для возбуждения флуоресценции уровня. После оптимизации параметров это позволило провести измерения с пространственным разрешением и установить характер распределения атомов кальция в плазме вдоль ее латеральной координаты. Ключевые слова: лазерно индуцированная плазма, лазерная атомно-флуоресцентная спектрометрия, пространственно-разрешенные исследования плазмы.

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The CaO orange system in meteor spectra

Cited by 20 publications

References 20 publications

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

The 2020 release of the ExoMol database: Molecular line lists for exoplanet and other hot atmospheres

ExoMol molecular line lists -- XLIII: Rovibronic molecular line list the low-lying two states of NaO

Наблюдение Атомной Флуоресценции Кальция В Лазерно Индуцированной Плазме С Высоким Пространственным Разрешением

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