Publications

We report accurate Ritz wavelengths for parity-forbidden [Ni II] transitions, derived from energy levels determined using high-resolution Fourier transform spectroscopy. Transitions between the 18 lowest Ni II energy levels of even-parity produced Ritz wavelengths for 126 parity-forbidden lines. Uncertainties for the Ritz wavelengths derived in this work are up to two orders of magnitude lower than previously published values. Transition probabilities were calculated using the semi-empirical orthogonal operator method, with uncertainties ranging from approximately 1 per cent for strong M1 lines and up to 10 per cent for weak E2 lines. Accurate forbidden line wavelengths and transition probabilities, particularly for lines in the infrared, are important in the analyses of low-density astrophysical plasmas, such as supernova remnants, planetary nebulae, and active galactic nuclei.

Journal article

Gilmore G, Randich S, Worley CC, Hourihane A, Gonneau A, Sacco GG, Lewis JR, Magrini L, Francois P, Jeffries RD, Koposov SE, Bragaglia A, Alfaro EJ, Allende Prieto C, Blomme R, Korn AJ, Lanzafame AC, Pancino E, Recio-Blanco A, Smiljanic R, Van Eck S, Zwitter T, Bensby T, Flaccomio E, Irwin MJ, Franciosini E, Morbidelli L, Damiani F, Bonito R, Friel ED, Vink JS, Prisinzano L, Abbas U, Hatzidimitriou D, Held E, Jordi C, Paunzen E, Spagna A, Jackson RJ, Maiz Apellaniz J, Asplund M, Bonifacio P, Feltzing S, Binney J, Drew J, Ferguson AMN, Micela G, Negueruela I, Prusti T, Rix H-W, Vallenari A, Bergemann M, Casey AR, de Laverny P, Frasca A, Hill V, Lind K, Sbordone L, Sousa SG, Adibekyan V, Caffau E, Daflon S, Feuillet DK, Gebran M, Gonzalez Hernandez J, Guiglion G, Herrero A, Lobel A, Montes D, Morel T, Ruchti G, Soubiran C, Tabernero HM, Tautvaisiene G, Traven G, Valentini M, Van der Swaelmen M, Villanova S, Vazquez CV, Bayo A, Biazzo K, Carraro G, Edvardsson B, Heiter U, Jofre P, Marconi G, Martayan C, Masseron T, Monaco L, Walton NA, Zaggia S, Borsen-Koch VA, Alves J, Balaguer-Nunez L, Barklem PS, Barrado D, Bellazzini M, Berlanas SR, Binks AS, Bressan A, Capuzzo-Dolcetta R, Casagrande L, Casamiquela L, Collins RS, D'Orazi V, Dantas MLL, Debattista VP, Delgado-Mena E, Di Marcantonio P, Drazdauskas A, Evans NW, Famaey B, Franchini M, Fremat Y, Fu X, Geisler D, Gerhard O, Solares EAG, Grebel EK, Gutierrez Albarran ML, Jimenez-Esteban F, Jonsson H, Khachaturyants T, Kordopatis G, Kos J, Lagarde N, Ludwig H-G, Mahy L, Mapelli M, Marfil E, Martell SL, Messina S, Miglio A, Minchev I, Moitinho A, Montalban J, Monteiro MJPFG, Morossi C, Mowlavi N, Mucciarelli A, Murphy DNA, Nardetto N, Ortolani S, Paletou F, Palous J, Pickering JC, Quirrenbach A, Fiorentin PR, Read J, Romano D, Ryde N, Sanna N, Santos W, Seabroke GM, Spina L, Steinmetz M, Stonkute E, Sutorius E, Thevenin F, Tosi M, Tsantaki M, Wright N, Wyse RFG, Zoccali M, Zorec J, Zucker DBet al., 2022,

The Gaia-ESO Public Spectroscopic Survey: Motivation, implementation, GIRAFFE data processing, analysis, and final data products☆

, ASTRONOMY & ASTROPHYSICS, Vol: 666, ISSN: 0004-6361

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Citations: 100

Journal article

Randich S, Gilmore G, Magrini L, Sacco GG, Jackson RJ, Jeffries RD, Worley CC, Hourihane A, Gonneau A, Vazquez CV, Franciosini E, Lewis JR, Alfaro EJ, Allende Prieto C, Bensby T, Blomme R, Bragaglia A, Flaccomio E, Francois P, Irwin MJ, Koposov SE, Korn AJ, Lanzafame AC, Pancino E, Recio-Blanco A, Smiljanic R, Van Eck S, Zwitter T, Asplund M, Bonifacio P, Feltzing S, Binney J, Drew J, Ferguson AMN, Micela G, Negueruela I, Prusti T, Rix H-W, Vallenari A, Bayo A, Bergemann M, Biazzo K, Carraro G, Casey AR, Damiani F, Frasca A, Heiter U, Hill V, Jofre P, de Laverny P, Lind K, Marconi G, Martayan C, Masseron T, Monaco L, Morbidelli L, Prisinzano L, Sbordone L, Sousa SG, Zaggia S, Adibekyan V, Bonito R, Caffau E, Daflon S, Feuillet DK, Gebran M, Gonzalez Hernandez J, Guiglion G, Herrero A, Lobel A, Maiz Apellaniz J, Merle T, Mikolaitis S, Montes D, Morel T, Soubiran C, Spina L, Tabernero HM, Tautvaisiene G, Traven G, Valentini M, Van der Swaelmen M, Villanova S, Wright NJ, Abbas U, Borsen-Koch VA, Alves J, Balaguer-Nunez L, Barklem PS, Barrado D, Berlanas SR, Binks AS, Bressan A, Capuzzo-Dolcetta R, Casagrande L, Casamiquela L, Collins RS, D'Orazi V, Dantas MLL, Debattista VP, Delgado-Mena E, Di Marcantonio P, Drazdauskas A, Evans NW, Famaey B, Franchini M, Fremat Y, Friel ED, Fu X, Geisler D, Gerhard O, Solares EAG, Grebel EK, Gutierrez Albarran ML, Hatzidimitriou D, Held E, Jimenez-Esteban F, Jonsson H, Jordi C, Khachaturyants T, Kordopatis G, Kos J, Lagarde N, Mahy L, Mapelli M, Marfil E, Martell SL, Messina S, Miglio A, Minchev I, Moitinho A, Montalban J, Monteiro MJPFG, Morossi C, Mowlavi N, Mucciarelli A, Murphy DNA, Nardetto N, Ortolani S, Paletou F, Palous J, Paunzen E, Pickering JC, Quirrenbach A, Fiorentin PR, Read J, Romano D, Ryde N, Sanna N, Santos W, Seabroke GM, Spagna A, Steinmetz M, Stonkute E, Sutorius E, Thevenin F, Tosi M, Tsantaki M, Vink JS, Wright N, Wyse RFG, Zoccali M, Zorec J, Zucker DB, Walton NAet al., 2022,

The Gaia-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy

, ASTRONOMY & ASTROPHYSICS, Vol: 666, ISSN: 0004-6361

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Citations: 121

Journal article

Ding M, Pickering JC, 2022,

Comment on: "Hyperfine structure measurements of Co I and Co II with Fourier transform spectroscopy" by Fu et al. [JQSRT 2021, 107590]

, JOURNAL OF QUANTITATIVE SPECTROSCOPY & RADIATIVE TRANSFER, Vol: 288, ISSN: 0022-4073

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Citations: 3

Journal article

Clear CP, Pickering JC, Nave G, Uylings P, Raassen Tet al., 2022,

Wavelengths and energy levels of singly ionized nickel (Ni ii) measured using fourier transform spectroscopy

, The Astrophysical Journal Supplement Series, Vol: 261, Pages: 35-35, ISSN: 0067-0049

High-resolution spectra of singly ionized nickel (Ni ii) have been recorded using Fourier transform spectroscopy in the region 143–5555 nm (1800–70,000 cm−1) with continuous, nickel–helium hollow cathode discharge sources. An extensive analysis of identified Ni ii lines resulted in the confirmation and revision of 283 previously reported energy levels, from the ground state up to the 3d8(ML)6s subconfigurations. Typical energy-level uncertainties are a few thousandths of a cm−1, representing at least an order-of-magnitude reduction in uncertainty with respect to previous measurements. Twenty-five new energy levels have now been established and are reported here for the first time. Eigenvector compositions of the energy levels have been calculated using the orthogonal operator method. In total, 159 even and 149 odd energy levels and 1424 classified line wavelengths of Ni ii are reported and will enable more accurate and reliable analyses of Ni ii in astrophysical spectra.

Journal article

Weiss Z, Concepcion-Mairey F, Pickering JC, Smid Pet al., 2021,

Emission spectroscopic study of an analytical glow discharge with plane and hollow cathodes: Titanium and iron in argon discharge

, SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY, Vol: 180, ISSN: 0584-8547

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Citations: 2

Journal article

Nave G, Clear C, 2021,

Reference wavelengths of Si ii, C ii, Fe i, and Ni ii for quasar absorption spectroscopy

, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, Vol: 502, Pages: 5679-5685, ISSN: 0035-8711

Journal article

Liggins FS, Pickering JC, Nave G, Kramida A, Gamrath S, Quinet Pet al., 2021,

New Ritz Wavelengths and Transition Probabilities of Parity-forbidden [Mn II] Lines of Astrophysical Interest

, ASTROPHYSICAL JOURNAL, Vol: 907, ISSN: 0004-637X

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Citations: 2

Journal article

Heiter U, Lind K, Bergemann M, Asplund M, Mikolaitis S, Barklem PS, Masseron T, de Laverny P, Magrini L, Edvardsson B, Jonsson H, Pickering JC, Ryde N, Aran AB, Bensby T, Casey AR, Feltzing S, Jofre P, Korn AJ, Pancino E, Damiani F, Lanzafame A, Lardo C, Monaco L, Morbidelli L, Smiljanic R, Worley C, Zaggia S, Randich S, Gilmore GFet al., 2021,

Atomic data for the Gaia-ESO Survey

, ASTRONOMY & ASTROPHYSICS, Vol: 645, ISSN: 0004-6361

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Citations: 70

Journal article

Liggins FS, Pickering JC, Nave G, Ward JW, Tchang-Brillet W-ULet al., 2021,

The Spectrum and Term Analysis of Singly Ionized Manganese

, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, Vol: 252, ISSN: 0067-0049

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Citations: 5

Journal article

Ding M, Pickering JC, 2020,

Measurements of the hyperfine structure of atomic energy levels in Co ii

, Astrophysical Journal Supplement Series, Vol: 251, Pages: 1-7, ISSN: 0067-0049

Analysis of hyperfine structure constants of singly ionized cobalt (Co II) were performed on cobalt spectra measured by Fourier transform spectrometers in the region 3000–63,000 cm−1 (33333 – 1587 Å). Fits to over 700 spectral lines led to measurements of 292 magnetic dipole hyperfine interaction A constants, with values between −32.5 mK and 59.5 mK (1 mK = 0.001 cm−1). Uncertainties of 255 A constants were between ±0.4 mK and ±3.0 mK, the remaining 37 ranged up to ±7 mK. The electric quadrupole hyperfine interaction B constant could be estimated for only one energy level. The number of Co II levels with known A values has now increased tenfold, improving and enabling the wider, more reliable, and accurate application of Co II in astronomical chemical abundance analyses.

Journal article

Murray JE, Brindley HE, Fox S, Bellisario C, Pickering JC, Fox C, Harlow C, Smith M, Anderson D, Huang X, Chen X, Last A, Bantges Ret al., 2020,

Retrievals of high latitude surface emissivity across the infrared from high altitude aircraft flights

, Journal of Geophysical Research: Atmospheres, Vol: 125, Pages: 1-16, ISSN: 2169-897X

We present retrievals of infrared spectral surface emissivities spanning the far and mid infrared from aircraft observations over Greenland, taken at an altitude of 9.2 km above sea level. We describe the flight campaign, available measurements and the retrieval method. The principal barriers to reducing uncertainty in the emissivity retrievals are found to be instrumental noise and our ability to simultaneously retrieve the underlying surface temperature. However, our results indicate that using the instrumentation available to us it is possible to retrieve emissivities from altitude with an uncertainty of ~ 0.02 or better across much of the infrared. They confirm that the far‐infrared emissivity of snow and ice surfaces can depart substantially from unity, reaching values as low as 0.9 between 400‐450 cm‐1. They also show good consistency with retrievals from the same flight made from near‐surface observations giving confidence in the methodology used and the results obtained for this more challenging viewing configuration. To the best of our knowledge, this is the first time that far‐infrared surface emissivity has been retrieved from altitude and demonstrates that the methodology has the potential to be extended to planned satellite far‐infrared missions.

A neural network approach for line detection in complex atomic emission spectra measured by high-resolution Fourier transform spectroscopy

Challenges in Atomic Spectroscopy of Low-Ionisation-Stage Heavy Elements for Astrophysics

Laboratory confirmation and improved accuracy of 4f and 5d energy levels of Fe ii previously identified from stellar spectra

Spectrum and energy levels of the high-lying singly excited configurations of Nd III: New Nd III experimental energy levels and wavelengths, with transition probability and ionisation energy calculations

Spectrum and energy levels of the low-lying configurations of Nd III

Wavelengths and Energy Levels of the Upper Levels of Singly Ionized Nickel (Ni <sc>ii</sc>) from 3<i>d</i> <SUP>8</SUP>(<SUP>3</SUP> <i>F</i>)5<i>f</i> to 3<i>d</i> <SUP>8</SUP>(<SUP>3</SUP> <i>F</i>)9<i>s</i>

New even parity fine structure energy levels of atomic vanadium

The Laboratory Astrophysics Programme at Imperial College London

New Ritz wavelengths and transition probabilities for parity-forbidden, singly ionized nickel [Ni II] lines of astrophysical interest

The <i>Gaia</i>-ESO Public Spectroscopic Survey: Motivation, implementation, GIRAFFE data processing, analysis, and final data products☆

The <i>Gaia</i>-ESO Public Spectroscopic Survey: Implementation, data products, open cluster survey, science, and legacy

Comment on: "Hyperfine structure measurements of Co I and Co II with Fourier transform spectroscopy" by Fu et al. [JQSRT 2021, 107590]

Wavelengths and energy levels of singly ionized nickel (Ni ii) measured using fourier transform spectroscopy

Emission spectroscopic study of an analytical glow discharge with plane and hollow cathodes: Titanium and iron in argon discharge

Reference wavelengths of Si ii, C ii, Fe i, and Ni ii for quasar absorption spectroscopy

New Ritz Wavelengths and Transition Probabilities of Parity-forbidden [Mn II] Lines of Astrophysical Interest

Atomic data for the Gaia-ESO Survey

The Spectrum and Term Analysis of Singly Ionized Manganese

Measurements of the hyperfine structure of atomic energy levels in Co ii

Retrievals of high latitude surface emissivity across the infrared from high altitude aircraft flights

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