Magnetic field dependence of the geminate recombination of radical ion pairs in polar solvents

K. Schulten, H. Staerk, A. Weller, H. J. Werner, B. Nickel

Research output: Contribution to journalArticle

Abstract

Pairs of radical ions are generated in polar solvents by nanosecond laser flashes in a singlet electron spin state via photoinduced electron transfer. The recombination monitored spectroscopically with a time resolution ~ 3 ns can be resolved into a fast geminate (~ 10 ns) and a slow homogeneous (~ 1000 ns) process. It has been observed for the system pyrene + 3, 5-dimethoxy-dimethylaniline in methanol that triplet products appear already during the geminate phase of the recombination. The yield of these fast triplet products is reduced by an external magnetic field of 500 Gauss to about 80% of its zero field value. The magnetic field dependence of this effect in the range 0–500 Gauss has been measured under stationary conditions. The results are found to be in agreement with a theoretical model based on the assumption that the change of spin multiplicity of the initial radical pairs originates from the hyperfine coupling between unpaired electron spins and nuclear spins within each radical.

Original languageEnglish (US)
Pages (from-to)371-390
Number of pages20
JournalZeitschrift fur Physikalische Chemie
Volume101
Issue number1-6
DOIs
StatePublished - Sep 1976

Fingerprint

Ions
Magnetic fields
electron spin
Electrons
magnetic fields
ions
pyrenes
products
nuclear spin
Methanol
flash
electron transfer
methyl alcohol
Lasers
lasers
pyrene

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry

Cite this

Magnetic field dependence of the geminate recombination of radical ion pairs in polar solvents. / Schulten, K.; Staerk, H.; Weller, A.; Werner, H. J.; Nickel, B.

In: Zeitschrift fur Physikalische Chemie, Vol. 101, No. 1-6, 09.1976, p. 371-390.

Research output: Contribution to journalArticle

Schulten, K. ; Staerk, H. ; Weller, A. ; Werner, H. J. ; Nickel, B. / Magnetic field dependence of the geminate recombination of radical ion pairs in polar solvents. In: Zeitschrift fur Physikalische Chemie. 1976 ; Vol. 101, No. 1-6. pp. 371-390.
@article{0e2634b444364058bc1145f10b68f798,
title = "Magnetic field dependence of the geminate recombination of radical ion pairs in polar solvents",
abstract = "Pairs of radical ions are generated in polar solvents by nanosecond laser flashes in a singlet electron spin state via photoinduced electron transfer. The recombination monitored spectroscopically with a time resolution ~ 3 ns can be resolved into a fast geminate (~ 10 ns) and a slow homogeneous (~ 1000 ns) process. It has been observed for the system pyrene + 3, 5-dimethoxy-dimethylaniline in methanol that triplet products appear already during the geminate phase of the recombination. The yield of these fast triplet products is reduced by an external magnetic field of 500 Gauss to about 80{\%} of its zero field value. The magnetic field dependence of this effect in the range 0–500 Gauss has been measured under stationary conditions. The results are found to be in agreement with a theoretical model based on the assumption that the change of spin multiplicity of the initial radical pairs originates from the hyperfine coupling between unpaired electron spins and nuclear spins within each radical.",
author = "K. Schulten and H. Staerk and A. Weller and Werner, {H. J.} and B. Nickel",
year = "1976",
month = "9",
doi = "10.1524/zpch.1976.101.1-6.371",
language = "English (US)",
volume = "101",
pages = "371--390",
journal = "Zeitschrift fur Physikalische Chemie",
issn = "0942-9352",
publisher = "Oldenbourg Wissenschaftsverlag GmbH",
number = "1-6",

}

TY - JOUR

T1 - Magnetic field dependence of the geminate recombination of radical ion pairs in polar solvents

AU - Schulten, K.

AU - Staerk, H.

AU - Weller, A.

AU - Werner, H. J.

AU - Nickel, B.

PY - 1976/9

Y1 - 1976/9

N2 - Pairs of radical ions are generated in polar solvents by nanosecond laser flashes in a singlet electron spin state via photoinduced electron transfer. The recombination monitored spectroscopically with a time resolution ~ 3 ns can be resolved into a fast geminate (~ 10 ns) and a slow homogeneous (~ 1000 ns) process. It has been observed for the system pyrene + 3, 5-dimethoxy-dimethylaniline in methanol that triplet products appear already during the geminate phase of the recombination. The yield of these fast triplet products is reduced by an external magnetic field of 500 Gauss to about 80% of its zero field value. The magnetic field dependence of this effect in the range 0–500 Gauss has been measured under stationary conditions. The results are found to be in agreement with a theoretical model based on the assumption that the change of spin multiplicity of the initial radical pairs originates from the hyperfine coupling between unpaired electron spins and nuclear spins within each radical.

AB - Pairs of radical ions are generated in polar solvents by nanosecond laser flashes in a singlet electron spin state via photoinduced electron transfer. The recombination monitored spectroscopically with a time resolution ~ 3 ns can be resolved into a fast geminate (~ 10 ns) and a slow homogeneous (~ 1000 ns) process. It has been observed for the system pyrene + 3, 5-dimethoxy-dimethylaniline in methanol that triplet products appear already during the geminate phase of the recombination. The yield of these fast triplet products is reduced by an external magnetic field of 500 Gauss to about 80% of its zero field value. The magnetic field dependence of this effect in the range 0–500 Gauss has been measured under stationary conditions. The results are found to be in agreement with a theoretical model based on the assumption that the change of spin multiplicity of the initial radical pairs originates from the hyperfine coupling between unpaired electron spins and nuclear spins within each radical.

UR - http://www.scopus.com/inward/record.url?scp=64349083274&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=64349083274&partnerID=8YFLogxK

U2 - 10.1524/zpch.1976.101.1-6.371

DO - 10.1524/zpch.1976.101.1-6.371

M3 - Article

AN - SCOPUS:64349083274

VL - 101

SP - 371

EP - 390

JO - Zeitschrift fur Physikalische Chemie

JF - Zeitschrift fur Physikalische Chemie

SN - 0942-9352

IS - 1-6

ER -