“…However, for reasons that could not be ascertained, the quality of the NH/Kr and, particularly, the NH/Xe spectra was severely worse when using the matrix-injection equipment. For NH/Xe, we resorted to data obtained in 1985 at the University of Virginia 8 using the same preparation methods but with earlier versions of the spectrometer , and matrix-injection system. , 1 Absorption (bottom) and temperature-dependent MCD spectra (1.00 T) of the (0, 0) band of the A 3 Π i ← X 3 Σ - transition of NH/Kr.…”
Section: Methodsmentioning
confidence: 99%
“…For NH/Xe, we resorted to data obtained in 1985 at the University of Virginia 8 using the same preparation methods but with earlier versions of the spectrometer 16,17 and matrix-injection system. 18,19…”
Magnetic circular dichroism (MCD) and absorption spectra are reported for the A 3 Π i r X 3 Σtransition of imidogen (NH) isolated in Kr, Xe, and N 2 matrices at cryogenic temperatures (∼1.4-20 K) and over a range of magnetic field strengths (0-5 T). The results are analyzed by the method of moments, and parameters are extracted by fitting the experimental data to a model in which the A 3 Π i term is split by spin-orbit (SO) coupling interactions and the X 3 Σterm is split by spin-spin and higher-order SO coupling. The analysis indicates that the ground-state NH radicals behave essentially as free rotors in the noble-gas matrices but as hindered rotors in solid N 2 . Trends in excited-state SO coupling constants are attributed to the external heavyatom effect.
“…However, for reasons that could not be ascertained, the quality of the NH/Kr and, particularly, the NH/Xe spectra was severely worse when using the matrix-injection equipment. For NH/Xe, we resorted to data obtained in 1985 at the University of Virginia 8 using the same preparation methods but with earlier versions of the spectrometer , and matrix-injection system. , 1 Absorption (bottom) and temperature-dependent MCD spectra (1.00 T) of the (0, 0) band of the A 3 Π i ← X 3 Σ - transition of NH/Kr.…”
Section: Methodsmentioning
confidence: 99%
“…For NH/Xe, we resorted to data obtained in 1985 at the University of Virginia 8 using the same preparation methods but with earlier versions of the spectrometer 16,17 and matrix-injection system. 18,19…”
Magnetic circular dichroism (MCD) and absorption spectra are reported for the A 3 Π i r X 3 Σtransition of imidogen (NH) isolated in Kr, Xe, and N 2 matrices at cryogenic temperatures (∼1.4-20 K) and over a range of magnetic field strengths (0-5 T). The results are analyzed by the method of moments, and parameters are extracted by fitting the experimental data to a model in which the A 3 Π i term is split by spin-orbit (SO) coupling interactions and the X 3 Σterm is split by spin-spin and higher-order SO coupling. The analysis indicates that the ground-state NH radicals behave essentially as free rotors in the noble-gas matrices but as hindered rotors in solid N 2 . Trends in excited-state SO coupling constants are attributed to the external heavyatom effect.
“…The consequent thermal gradients (both within the sample and between the sample and the thermal sensor) are essentially unmeasurable and can lead to substantial thermometry errors. The only documented method of overcoming this problem involves an “injection” technique, where the sample is prepared in a vacuum then rapidly transferred (injected) into a chamber that is immediately flooded with cryogen . Examples of the successful application of the techniques are sparse, − principally because active cooling of the sample is suspended during injection.…”
Section: Introductionmentioning
confidence: 99%
“…The only documented method of overcoming this problem involves an "injection" technique, where the sample is prepared in a vacuum then rapidly transferred (injected) into a chamber that is immediately flooded with cryogen. 19 Examples of the successful application of the techniques are sparse, [20][21][22] principally because active cooling of the sample is suspended during injection. Unless the procedure is exceedingly well coordinated, the temperature can rise above ∼30 K, which destroys the sample.…”
Weak temperature dependence is reported for the Q-band magnetic
circular dichroism of Cu phthalocyanine
in an Ar matrix between 15 and 1.5 K. Moment analysis reveals a
zero-field splitting of 1.5 ± 0.5 cm-1
in
the singdoublet Q state. This is interpreted to be a consequence
of interference between spin−orbit coupling
and exchange interactions with the tripdoublet state.
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