Cargando…

Thermal reaction and luminescence of long-lived N (2)D in N(2) ice

Photochemistry of an N(2) ice and thermal reaction of the irradiated sample were studied with vacuum-ultraviolet (VUV) light from a synchrotron. Concurrent detection of infrared absorption and visible emission spectra provide evidence for the generation of energetic products N ((2)D) and N ((2)P) at...

Descripción completa

Detalles Bibliográficos
Autores principales: Lo, Jen-Iu, Chou, Sheng-Lung, Peng, Yu-Chain, Lu, Hsiao-Chi, Cheng, Bing-Ming
Formato: Online Artículo Texto
Lenguaje:English
Publicado: National Academy of Sciences 2019
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900521/
https://www.ncbi.nlm.nih.gov/pubmed/31732669
http://dx.doi.org/10.1073/pnas.1910647116
_version_ 1783477366481223680
author Lo, Jen-Iu
Chou, Sheng-Lung
Peng, Yu-Chain
Lu, Hsiao-Chi
Cheng, Bing-Ming
author_facet Lo, Jen-Iu
Chou, Sheng-Lung
Peng, Yu-Chain
Lu, Hsiao-Chi
Cheng, Bing-Ming
author_sort Lo, Jen-Iu
collection PubMed
description Photochemistry of an N(2) ice and thermal reaction of the irradiated sample were studied with vacuum-ultraviolet (VUV) light from a synchrotron. Concurrent detection of infrared absorption and visible emission spectra provide evidence for the generation of energetic products N ((2)D) and N ((2)P) atoms, N(2) (A) molecule and linear-N(3) (l-N(3)) radical after excitation of icy N(2) at 121.6 nm. Irradiation at 190 nm is shown to be an effective way to eliminate the l-N(3) radical. After the photolysis and photoelimination of the l-N(3), we initiate synthesis of l-N(3) via the thermal ramping of the sample in temperature range 3.5 to 20 K. In addition, the emission from the N ((2)D) atom was observed during the thermal ramping process. These behaviors indicate that a long-lived N ((2)D(long)) atom is generated in the VUV-photolyzed N(2) ice. A comparison of the variations of the visible emission of N ((2)D) and the infrared absorption of l-N(3) with time indicates that the long-lived N ((2)D(long)) dominated the thermal synthesis of l-N(3). The results have enhanced suggestion and understanding of the conversion for nitrogen species in cold astrophysical environments with VUV irradiation.
format Online
Article
Text
id pubmed-6900521
institution National Center for Biotechnology Information
language English
publishDate 2019
publisher National Academy of Sciences
record_format MEDLINE/PubMed
spelling pubmed-69005212019-12-12 Thermal reaction and luminescence of long-lived N (2)D in N(2) ice Lo, Jen-Iu Chou, Sheng-Lung Peng, Yu-Chain Lu, Hsiao-Chi Cheng, Bing-Ming Proc Natl Acad Sci U S A Physical Sciences Photochemistry of an N(2) ice and thermal reaction of the irradiated sample were studied with vacuum-ultraviolet (VUV) light from a synchrotron. Concurrent detection of infrared absorption and visible emission spectra provide evidence for the generation of energetic products N ((2)D) and N ((2)P) atoms, N(2) (A) molecule and linear-N(3) (l-N(3)) radical after excitation of icy N(2) at 121.6 nm. Irradiation at 190 nm is shown to be an effective way to eliminate the l-N(3) radical. After the photolysis and photoelimination of the l-N(3), we initiate synthesis of l-N(3) via the thermal ramping of the sample in temperature range 3.5 to 20 K. In addition, the emission from the N ((2)D) atom was observed during the thermal ramping process. These behaviors indicate that a long-lived N ((2)D(long)) atom is generated in the VUV-photolyzed N(2) ice. A comparison of the variations of the visible emission of N ((2)D) and the infrared absorption of l-N(3) with time indicates that the long-lived N ((2)D(long)) dominated the thermal synthesis of l-N(3). The results have enhanced suggestion and understanding of the conversion for nitrogen species in cold astrophysical environments with VUV irradiation. National Academy of Sciences 2019-12-03 2019-11-15 /pmc/articles/PMC6900521/ /pubmed/31732669 http://dx.doi.org/10.1073/pnas.1910647116 Text en Copyright © 2019 the Author(s). Published by PNAS. https://creativecommons.org/licenses/by-nc-nd/4.0/ https://creativecommons.org/licenses/by-nc-nd/4.0/This open access article is distributed under Creative Commons Attribution-NonCommercial-NoDerivatives License 4.0 (CC BY-NC-ND) (https://creativecommons.org/licenses/by-nc-nd/4.0/) .
spellingShingle Physical Sciences
Lo, Jen-Iu
Chou, Sheng-Lung
Peng, Yu-Chain
Lu, Hsiao-Chi
Cheng, Bing-Ming
Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title_full Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title_fullStr Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title_full_unstemmed Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title_short Thermal reaction and luminescence of long-lived N (2)D in N(2) ice
title_sort thermal reaction and luminescence of long-lived n (2)d in n(2) ice
topic Physical Sciences
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6900521/
https://www.ncbi.nlm.nih.gov/pubmed/31732669
http://dx.doi.org/10.1073/pnas.1910647116
work_keys_str_mv AT lojeniu thermalreactionandluminescenceoflonglivedn2dinn2ice
AT choushenglung thermalreactionandluminescenceoflonglivedn2dinn2ice
AT pengyuchain thermalreactionandluminescenceoflonglivedn2dinn2ice
AT luhsiaochi thermalreactionandluminescenceoflonglivedn2dinn2ice
AT chengbingming thermalreactionandluminescenceoflonglivedn2dinn2ice