Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects

Marcin Konowalczyk; Olivia Foster Vander Elst; Jonathan G. Storey

doi:10.1039/d0cp04814c

Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects

Marcin Konowalczyk^*, Olivia Foster Vander Elst, Jonathan G. Storey

^*Corresponding author af dette arbejde

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

1 Citationer (Scopus)

Abstract

Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene/1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance (PyH10), and perdeuterated (PyD10) pyrene samples.

Originalsprog	Engelsk
Tidsskrift	Physical Chemistry Chemical Physics
Vol/bind	23
Nummer	2
Sider (fra-til)	1273-1284
Antal sider	12
ISSN	1463-9076
DOI	https://doi.org/10.1039/d0cp04814c
Status	Udgivet - 14 jan. 2021
Udgivet eksternt	Ja

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@article{d8575b394426418c9e79646d78f2863b,

title = "Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects",

abstract = "Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene/1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance (PyH10), and perdeuterated (PyD10) pyrene samples.",

author = "Marcin Konowalczyk and {Foster Vander Elst}, Olivia and Storey, {Jonathan G.}",

note = "Funding Information: First and foremost, the authors would like to thank Prof. Christiane Timmel for supervision of their studies and insightful comments on the manuscript. We would like to thank the EMF Biological Research Trust and Air Force Office of Scientific Research (AFOSR, USAF award number FA9550-14-1-0095) for funding; Electronics Workshop in Physical and Theoretical Chemistry Laboratory (University of Oxford), and especially Neville Baker, Phillip Hurst, John Adams and Timothy Powell for building components of the experiment; Dr Christan Kerpal, Gabriel Moise, Matthew Golesworthy and Victoire D{\'e}jean for proofreading; Dr Sabine Richert for helpful discussions and Dr William Myers for paper suggestions. Further, the authors would like to extend their thanks to The On-Line encyclopedia of Integer Sequences,49 and the Matplotlib development team.50 Publisher Copyright: {\textcopyright} the Owner Societies.",

year = "2021",

month = jan,

day = "14",

doi = "10.1039/d0cp04814c",

language = "English",

volume = "23",

pages = "1273--1284",

journal = "Physical Chemistry Chemical Physics",

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publisher = "Royal Society of Chemistry",

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Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects. / Konowalczyk, Marcin; Foster Vander Elst, Olivia; Storey, Jonathan G.
I: Physical Chemistry Chemical Physics, Bind 23, Nr. 2, 14.01.2021, s. 1273-1284.

Publikation: Bidrag til tidsskrift/Konferencebidrag i tidsskrift /Bidrag til avis › Tidsskriftartikel › Forskning › peer review

TY - JOUR

T1 - Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects

AU - Konowalczyk, Marcin

AU - Foster Vander Elst, Olivia

AU - Storey, Jonathan G.

N1 - Funding Information: First and foremost, the authors would like to thank Prof. Christiane Timmel for supervision of their studies and insightful comments on the manuscript. We would like to thank the EMF Biological Research Trust and Air Force Office of Scientific Research (AFOSR, USAF award number FA9550-14-1-0095) for funding; Electronics Workshop in Physical and Theoretical Chemistry Laboratory (University of Oxford), and especially Neville Baker, Phillip Hurst, John Adams and Timothy Powell for building components of the experiment; Dr Christan Kerpal, Gabriel Moise, Matthew Golesworthy and Victoire Déjean for proofreading; Dr Sabine Richert for helpful discussions and Dr William Myers for paper suggestions. Further, the authors would like to extend their thanks to The On-Line encyclopedia of Integer Sequences,49 and the Matplotlib development team.50 Publisher Copyright: © the Owner Societies.

PY - 2021/1/14

Y1 - 2021/1/14

N2 - Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene/1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance (PyH10), and perdeuterated (PyD10) pyrene samples.

AB - Modulated magnetically altered reaction yield (ModMARY) spectroscopy is a derivative variant of fluorescence detected magnetic field effect measurement, where the applied magnetic field has both a constant and a modulated component. As in many derivative spectroscopy techniques, the signal to noise ratio scales with the magnitude of the modulation. High modulation amplitudes, however, distort the signal and can obscure small features of the measured spectrum. In order to detect weak magnetic field effects (including the low field effect) a balance of the two has to be found. In this work we look in depth at the origin of the distortion of the MARY signal by field modulation. We then present an overtone detection scheme, as well as a data analysis method which allows for correct fitting of both harmonic and overtone signals of the modulation broadened MARY data. This allows us to robustly reconstruct the underlying MARY curve at different modulation depths. To illustrate the usefulness of the technique, we show measurements and analysis of a well known magnetosensitive system of pyrene/1,3-dicyanobenzene (Py/DCB). The measurements of first (h1) and second (h2) harmonic spectra are performed at different modulation depths for both natural isotopic abundance (PyH10), and perdeuterated (PyD10) pyrene samples.

UR - http://www.scopus.com/inward/record.url?scp=85100068280&partnerID=8YFLogxK

U2 - 10.1039/d0cp04814c

DO - 10.1039/d0cp04814c

M3 - Journal article

C2 - 33355552

AN - SCOPUS:85100068280

SN - 1463-9076

VL - 23

SP - 1273

EP - 1284

JO - Physical Chemistry Chemical Physics

JF - Physical Chemistry Chemical Physics

IS - 2

ER -

Development of lock-in based overtone modulated MARY spectroscopy for detection of weak magnetic field effects

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