{"help":"Return the metadata of a dataset (package) and its resources. :param id: the id or name of the dataset :type id: string","success":true,"result":[{"id":"58bf1e79-001b-426d-b1ff-e3e0c84f7539","name":"time-evolution-co2-ro-vibrational-excitation-nanosecond-discharge-measured-laser-absorption","title":"Time evolution of CO2 ro-vibrational excitation in a nanosecond discharge measured with laser absorption spectroscopy","author":"Yanjun Du","author_email":"duyanjun13@gmail.com","maintainer":"Research Data Repository","maintainer_email":"achim.vonkeudell@rub.de","license_title":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/","notes":"\u003Cp\u003E\u003Cem\u003EThe results in this dataset have been published in J. Phys. D: Appl. Phys. 54 (2021) 365201. \u003C\/em\u003E \u003Cbr \/\u003E CO2 dissociation stimulated by vibrational excitation in non-equilibrium discharges has drawn lots of attention. Nanosecond (ns) discharges are known for their highly non-equilibrium conditions. It is therefore of interest to investigate the CO2 excitation in such discharges. In this paper, we demonstrate the ability for monitoring the time evolution of CO2 ro-vibrational excitation with a well-selected wavelength window around 2289.0 cm\u22121 and a single\u003Cbr \/\u003E\ncontinuous-wave quantum cascade laser with both high accuracy and temporal resolution. The rotational and vibrational temperatures for both the symmetric and the asymmetric modes of CO2 in the afterglow of CO2 + He ns-discharge were measured with a temporal resolution of 1.5 \u00b5s. The non-thermal feature and the preferential excitation of the asymmetric stretch mode of CO2 were experimentally observed, with a peak temperature of Tv3, max = 966 \u00b1 1.5 K, Tv1,2, max = 438.4 \u00b1 1.2 K and Trot = 334.6 \u00b1 0.6 K reached at 3 \u00b5s after the nanosecond pulse.\u003Cbr \/\u003E\nIn the following relaxation process, an exponential decay with a time constant of 69 \u00b5s was observed for the asymmetric stretch (001) state, consistent with the dominant deexcitation mechanism due to VT transfer with He and deexcitation on the wall. Furthermore, a synchronous oscillation of the gas temperature and the total pressure was also observed and can be explained by a two-line thermometry and an adiabatic process. The period of the oscillation\u003Cbr \/\u003E\nand its dependence on the gas components is consistent with a standing acoustic wave excited by the ns-discharge.\u003C\/p\u003E\n","url":"https:\/\/rdpcidat.rub.de\/dataset\/time-evolution-co2-ro-vibrational-excitation-nanosecond-discharge-measured-laser-absorption","state":"Active","log_message":"Edited by kd.","private":true,"revision_timestamp":"Sat, 05\/04\/2024 - 11:03","metadata_created":"Wed, 08\/04\/2021 - 16:11","metadata_modified":"Sat, 05\/04\/2024 - 11:03","creator_user_id":"5b68ac99-1d8e-4dbb-a3cb-f2892a2fdcbe","type":"Dataset","resources":[{"id":"2ea89906-53fe-441b-8954-f7d80e8b32dc","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%201b.txt","description":"\u003Cp\u003EVoltage, current and coupled energy waveforms for the investigated discharge condition: 10% CO2 + He at 145 mbar with a repetition rate of 2 kHz and pulse length of 150 ns\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 1b","mimetype":"text\/plain","size":"286.04 KB","created":"Sat, 08\/14\/2021 - 16:44","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"ab103f77-a520-4dc6-ab00-49300e8c6368","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%202_2.txt","description":"\u003Cp\u003EComparison of the absorption calculated with the model in this publication and with HAPI at equilibrium condition (Trot = Tv1 = Tv2 = Tv3 = 1000 K) for 10% CO2, p = 0.03 atm and l = 1 cm.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 2","mimetype":"text\/plain","size":"64.42 KB","created":"Thu, 08\/05\/2021 - 17:00","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"9aabf9db-eb06-4f8c-8711-a82a77cfce47","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%203_0.txt","description":"\u003Cp\u003EFit to a non-equilibrium CO2 absorption from the literature \uff08Dang C, Reid J and Garside B K 1982 Appl. Phys. B 27 145\u201351\uff09. The values are in the column Exp. The fit is performed with two settings: equal temperatures for the v1 and v2 modes (column T_1=T_2) and independent temperatures for all vibrational modes (column T_1,T_2).\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 3","mimetype":"text\/plain","size":"39.79 KB","created":"Thu, 08\/05\/2021 - 17:26","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"d86e6bc2-232e-460c-80a7-9ceee6f5529e","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%204%20b.txt","description":"\u003Cp\u003EThe simulated absorption spectra in the selected wavelength range at room temperature and at non-equilibrium conditions with p = 145 mbar, 10% CO2, l = 2 cm.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 4b","mimetype":"text\/plain","size":"98.86 KB","created":"Sun, 08\/15\/2021 - 15:13","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"f77044c0-0c97-4c77-b526-869f3ecf6e50","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%205.txt","description":"\u003Cp\u003EExample of the detected spectra for a time series measurement. The QCL is scanned by temperature with f = 10 mHz. The discharge is operated with 10% CO2 + He at 2 kHz with a voltage of 3 kV, current of \u223c6 A, and a pulse length of 150 ns. The laser wavenumber tuning starts from 2288.34 cm-1 with a scanning rate of around 0.027 cm^-1\/s. Etalon: light intensity with etalon to characterize the laser wavenumber; It0: transmitted light intensity with gas mixture but without discharge; I0: incident light intensity without gas mixture; It: transmitted light intensity with gas mixture and discharge.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 5","mimetype":"text\/plain","size":"29.01 MB","created":"Fri, 08\/06\/2021 - 06:56","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"f1984cea-96a5-4b78-bb00-38908ba9063d","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%206_0.txt","description":"\u003Cp\u003EAbsorbance of the CO2 gas mixture without discharge and before the discharge pulse (t = 0 \u00b5s) for the target scan range. The data in the column marked as \u0022w\/ discharge t=0\u0027\u0027 is shifted horizontally by 0.05 cm\u22121 for clear comparison.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 6","mimetype":"text\/plain","size":"256.1 KB","created":"Fri, 08\/06\/2021 - 14:16","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"dfe43140-c291-4e05-a306-c78fc9943631","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%207_1.txt","description":"\u003Cp\u003ETime evolution of the measured absorbance in the afterglow of the nanosecond discharge. The first row and the first column of the matrix represents the sampling time points and the wavenumber, respectively. The columns from the second one denote the measured absorption versus wavenumber at the corresponding time point. The discharge is operated with 10% CO2 + He at 145 mbar with a frequency of 2 kHz, a voltage of 3 kV (I \u223c 6 A), and a pulse length of 150 ns.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 7","mimetype":"text\/plain","size":"15.81 MB","created":"Fri, 08\/06\/2021 - 14:08","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"e2fb0024-1fdb-44b7-8731-c969207fe7cc","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%208_2.txt","description":"\u003Cp\u003EExamples of fitted absorption spectra together with the corresponding fitting residual for a discharge of 10% CO2 + He with a frequency of 2 kHz, voltage of 3 kV and a pulse length of 150 ns. (a) Before discharge pulse t = 0 \u00b5s and t = 300 \u00b5s; (b) t = 3 \u00b5s when Tv3 reaches the maximum. The column marked as Bg. denotes the fitted absorption from the background CO2 that are defined as the CO2 in the gap between the discharge and the optical windows.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 8","mimetype":"text\/plain","size":"462.25 KB","created":"Sat, 08\/07\/2021 - 11:54","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"0ecf859b-57d0-4ee9-b15c-ddf8c450986a","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%209_0.txt","description":"\u003Cp\u003ETime evolution of the best-fit rotational temperature and vibrational temperatures in the afterglow of the nanosecond discharge with 10% CO2 + He. The discharge condition is the same as that in figure 7. The data for the inset is contained in the column Number density and represents the normalized number density of the (001) state versus time. The columns labeled Error are the uncertainties for the previous column and are obtained from the fitting routine.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 9","mimetype":"text\/plain","size":"42.43 KB","created":"Sat, 08\/07\/2021 - 12:13","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"c9af2e72-e4a6-4df1-ae73-2e71842b7323","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%2010_0.txt","description":"\u003Cp\u003EValidation of the best-fit rotational temperature and pressure from the broadband spectrum fitting with the generally used two-line thermometry method (with peaks \u20180\u2019 and \u20183\u2019) in conventional TDLAS.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 10","mimetype":"text\/plain","size":"32.96 KB","created":"Sat, 08\/07\/2021 - 12:21","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"},{"id":"55ed5ed1-d1fc-4b3b-a5d1-95f1b1e739ac","revision_id":"","url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/Fig%2011_2.txt","description":"\u003Cp\u003EThe area ratio of peak \u20183\u2019 and \u20180\u2019 deduced from the single-peak fitting with different CO2 concentrations. The total pressure remains 150 mbar in all cases.\u003C\/p\u003E\n","format":"txt","state":"Active","revision_timestamp":"Sun, 08\/15\/2021 - 16:38","name":"Fig 11","mimetype":"text\/plain","size":"23.99 KB","created":"Sat, 08\/07\/2021 - 12:40","resource_group_id":"295bcc10-edab-46be-bd9b-6d94d38e8298","last_modified":"Date changed  Sun, 08\/15\/2021 - 16:38"}],"tags":[{"id":"6ea8c330-1e20-4585-a5f7-05aa778976c0","vocabulary_id":"2","name":"APPJ"},{"id":"dfe54e34-43c1-4e83-9afc-ab8c23388efc","vocabulary_id":"2","name":"carbon dioxide"},{"id":"91596d33-0a2b-4d56-a3e9-18172c43e2de","vocabulary_id":"2","name":"absorption spectroscopy"},{"id":"a9fac56b-cb04-4ab5-b46b-ee2ace4221b6","vocabulary_id":"2","name":"nanosecond discharge"},{"id":"35dfc4ec-e7cc-4998-b5d4-d246c890e416","vocabulary_id":"2","name":"vibrational temperatures"}],"groups":[{"description":"\u003Cp\u003EChair experimental physics V \u0022atom and laser physics\u0022 at the faculty of physics and astronomy at Ruhr University Bochum\u003C\/p\u003E\n","id":"295bcc10-edab-46be-bd9b-6d94d38e8298","image_display_url":"https:\/\/rdpcidat.rub.de\/sites\/default\/files\/rublogoweiss_1.png","title":"EP5","name":"group\/ep5"}]}]}