THE λ4050 BANDS OF THE C313 MOLECULE

1954 ◽  
Vol 32 (5) ◽  
pp. 319-325 ◽  
Author(s):  
K. Clusius ◽  
A. E. Douglas
Keyword(s):  
High Resolution ◽  
Isotope Effects ◽  
Good Evidence ◽  
B Values ◽  
Carbon Molecule

The λ4050 bands, excited with the pure C13 isotope, have been photographed under high resolution. The lines of the strongest band show a 3: 1 intensity alternation. The B values of the C13 band are in the ratio 12: 13 to the B values of the corresponding C12 band. These isotope effects are interpreted as giving very good evidence that the λ4050 band is emitted by a triatomic carbon molecule C3.

High-Resolution FTS Study of Isotope Effects in LiLuF4·Ho3+

1997 ◽  
pp. 579-580
Author(s):  
Marina N. Popova ◽  
Serguey A. Klimin ◽  
Guerman N. Zhizhin
Keyword(s):  
High Resolution ◽  
Isotope Effects

Electronic spectra of metal ion – rare gas pairs: High resolution analysis of the A2Πr–X2Σ+ system of BeKr+

1977 ◽  
Vol 55 (3) ◽  
pp. 254-260 ◽  
Author(s):  
J. A. Coxon ◽  
W. E. Jones ◽  
K. V. Subbaram
Keyword(s):  
High Resolution ◽  
Metal Ion ◽  
Isotope Effects ◽  
Spin Splitting ◽  
Rare Gas ◽  
Molecular Constants ◽  
Naturally Occurring ◽  
High Resolution Analysis ◽  
Resolution Analysis ◽  
Splitting Constant

The A2Πr–X2Σ+ system of Be84Kr+ has been studied at high resolution in the region 3950–4265 Å. Rotational analyses have been performed for the 0–1, 0–0, 1–0, and 2–0 bands, and molecular constants have been determined by least squares fits of the line frequencies to model Hamiltonians. The regular nature of the excited state has been confirmed, despite the opposite signs found for the Λ-doubling constants, p and q. Comparisons of the Λ-doubling constants for the A2Πr state and of the spin-splitting constant (γ) for the X2Σ+ state have been made with those for other nine valence-electron diatomics. Although a systematic study of isotope effects due to the several isotopes of naturally-occurring krypton has not been possible, at least one branch of the 1–0 band of Be86Kr+ has been identified unequivocally.

Isotope effects on the resonance interactions and vibrational quantum dynamics of fluoroform 12,13CHF3

2017 ◽  
Vol 19 (39) ◽  
pp. 26527-26534 ◽  
Author(s):  
Sieghard Albert ◽  
Elena Bekhtereva ◽  
Irina Bolotova ◽  
Ziqiu Chen ◽  
Csaba Fábri ◽  
...  
Keyword(s):  
High Resolution ◽  
Quantum Dynamics ◽  
Isotope Effects ◽  
Low Energy ◽  
Energy Spectra ◽  
Resonance Interactions

We report a comparison of the vibrational quantum dynamics based on the analysis of the low energy spectra of 13CHF3 and 12CHF3 from the THz (FIR) range to the ν1 fundamental at high resolution ( or Doppler limited).

scholarly journals Radio Source Variability as a Tool for Very High Resolution

1994 ◽  
Vol 158 ◽  
pp. 201-203
Author(s):  
N. Shapirovskaya ◽  
O. B. Slee ◽  
P. Hughes ◽  
G. Tsarevsky
Keyword(s):  
High Resolution ◽  
Radio Source ◽  
Time Scale ◽  
High Frequency ◽  
Angular Resolution ◽  
Good Evidence ◽  
High Angular Resolution ◽  
Intrinsic Variability ◽  
Interstellar Plasma ◽  
Very High

If flux density variability is intrinsic to extragalactic sources, then the shortest time scale of the variability yields an extremely high angular resolution. There is, however, good evidence that some of the variability is due to refractive scintillation in our galaxy's interstellar plasma turbulence. The effect, initially discovered at low radio frequencies, is here shown to extend into the GHz band, which, up to now, has been assumed to display only the intrinsic variability. We conclude that further study in both the intermediate and high frequency bands needed to separate the intrinsic and extrinsic components of variability.

scholarly journals Evaluating High Spatial Resolution Diffusion Kurtosis Imaging at 3T: Reproducibility and Quality of Fit

2020 ◽  
Author(s):  
Loxlan W. Kasa ◽  
Roy A.M. Haast ◽  
Tristan K. Kuehn ◽  
Farah N. Mushtaha ◽  
Corey A. Baron ◽  
...  
Keyword(s):  
White Matter ◽  
High Resolution ◽  
Diffusion Kurtosis Imaging ◽  
List Type ◽  
Whole Brain ◽  
B Values ◽  
Phantom Data ◽  
Diffusion Kurtosis ◽  
Fitting Accuracy

ABSTRACTBackgroundDiffusion kurtosis imaging (DKI) quantifies the microstructure’s non-Gaussian diffusion properties. However, it has increased fitting parameters and requires higher b-values. Evaluation of DKI reproducibility is important for clinical purposes.PurposeTo assess reproducibility in whole-brain high resolution DKI at varying b-values.Study TypeProspective.Subjects and PhantomsForty-four individuals from the test-retest Human Connectome Project (HCP) database and twelve 3D-printed tissue mimicking phantoms.Field Strength/SequenceMultiband echo-planar imaging for in vivo and phantom diffusion-weighted imaging at 3T and 9.4T respectively. MPRAGE at 3T for in vivo structural data.AssessmentFrom HCP data with b-value =1000,2000,3000 s/mm2 (dataset A), two additional datasets with b-values=1000, 3000 s/mm2 (dataset B) and b-values=1000, 2000 s/mm2 (dataset C) were extracted. Estimated DKI metrics from each dataset were used for evaluating reproducibility and fitting quality in whole-brain white matter (WM), region of interest (ROI) and gray matter (GM).Statistical TestsDKI reproducibility was assessed using the within-subject coefficient of variation (CoV), fitting residuals to evaluate DKI fitting accuracy and Pearson’s correlation to investigate presence of systematic biases.ResultsCompared to dataset C, the CoV from DKI parameters from datasets A and B were comparable, with WM and GM CoVs <20%, while differences between datasets were smaller for the DKI-derived DTI parameters. Slightly higher fitting residuals were observed in dataset C compared to A and B, but lower residuals in dataset B were detected for the WM ROIs. A similar trend was observed for the phantom data with comparable CoVs at varying fiber orientations for datasets A and B. In addition, dataset C was characterized by higher residuals across the different fiber crossings.Data ConclusionThe comparable reproducibility of DKI maps between datasets A and B observed in the in vivo and phantom data indicates that high reproducibility can still be achieved within a reasonable scan time, supporting DKI for clinical purposes.HIGHLIGHTS:Reproducibility and fitting accuracy of high resolution DKI were evaluated as function of available b-values.A DKI dataset with b-values of 1000 and 3000 s/mm2 performs equally well as the original HCP three-shell dataset, while a dataset with b-values of 1000 and 2000 s/mm2 has lower reproducibility and fitting quality.In vivo results were verified using phantoms capable of mimicking different white matter configurations.These results suggest that DKI data can be obtained within less time, without sacrificing data quality.

High-resolution spectroscopy of the (000)–(000) band of the CaOD radical

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1200-1205 ◽  
Author(s):  
Mingguang Li ◽  
John A. Coxon
Keyword(s):  
High Resolution ◽  
Gas Phase ◽  
Ground State ◽  
Measurement Accuracy ◽  
Isotope Effects ◽  
Spin Rotation ◽  
High Resolution Spectroscopy ◽  
Rotational Line ◽  
Measured Line ◽  
Line Positions

The [Formula: see text] (000)–(000) band of the gas-phase CaOD radical has been rotationally analyzed using high-resolution laser spectroscopy. The technique of intermodulated fluorescence was employed to resolve the small spin-rotation splittings in the ground state. The measurement accuracy of the rotational line positions was 0.003 cm−1. The measured line positions have been employed in a least-squares estimation of the molecular constrants for both electronic states. Isotope relations between the constants of CaOH and CaOD are examined, and the constants AD and γ for the Ã2Π(000) level were separated using isotope effects.

Reinvestigation of the A2Π–X2Σ+band system of the BeI molecule

1977 ◽  
Vol 55 (2) ◽  
pp. 129-133 ◽  
Author(s):  
M. Carleer ◽  
R. Colin
Keyword(s):  
High Resolution ◽  
Intensity Ratio ◽  
Band System ◽  
Molecular Constants ◽  
B Values

The 0–0 band of the A2Π–X2Σ+ transition of the BeI molecule has been reinvestigated at high resolution. The rotational assignments of the 2Π1/2–2Σ+ subband have been revised and the analysis has been extended to the 2Π3/2–2Σ+ subband. The principal molecular constants determined are:[Formula: see text]The anomaly between the B values of the A2Π1/2 and A2Π3/2 substates and in the intensity ratio of both subbands is tentatively explained.

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