NO2 lifetimes by hanle effect measurements

Weber, H.G.; Bylicki, F.

doi:10.1016/0301-0104(87)80075-7

Cited by 16 publications

(15 citation statements)

References 12 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Similar results as in Fig. 4 are obtained on all (about 20) investigated absorption lines near the wavelengths 593 nm and 514 nm [29,34]. The broad resonance, which we call "σ-resonance", represents predominantly a change (up to 20%) of the total fluorescence intensity F with a minimum of the fluorescence intensity at B = 0.…”

Section: Inversion Effectsupporting

confidence: 86%

See 1 more Smart Citation

An effect of extra compactified dimensions of space in the molecule $$\hbox {NO}_{{2}}$$

Weber

2021

Eur. Phys. J. D

View full text Add to dashboard Cite

The theory of large extra compactified dimensions of space (ADD-model) predicts that gravity may become strong in a compactification space of the size of a molecule and may affect the vibrational motion of a molecule. In triatomic molecules like $$\hbox {NO}_{{2}}$$ NO 2 nuclear dynamics is strongly coupled to electronic dynamics at the intersection of electronic states (conical intersection). We discuss experimental results on $$\hbox {NO}_{{2}}$$ NO 2 which reveal that the collision-free molecule optically excited into a symmetric stretch vibration mode of an electronic state with conical intersection undergoes an irreversible non-radiative transition into an asymmetric stretch vibration mode in combination with a change of the electronic state. We suggest ascribing this irreversible non-radiative transition to a gravitational perturbation on the vibrational motion in $$\hbox {NO}_{{2}}$$ NO 2 . This gravitational perturbation deactivates the upper state of the optical transition. The width of the absorption line is given by the characteristic time of the gravitational perturbation and not by the radiative lifetime of the excited molecular state. Graphical abstract

show abstract

Section: Inversion Effectsupporting

confidence: 86%

“…4) and from the width of a microwave optical double resonance signal [33]. Moreover, we obtain τ 0 from the width of various "enhanced absorption resonances" ( [34][35][36] and Sect. 5), and from the width of optical absorption lines ( [37] and Sect.…”

Section: Introductionmentioning

confidence: 99%

An effect of extra compactified dimensions of space in the molecule $$\hbox {NO}_{{2}}$$

Weber

2021

Eur. Phys. J. D

View full text Add to dashboard Cite

show abstract

“…As was shown in particular for the 'broad rf-resonance', these resonance signals are strongly related with the inversion effect [28]. Using these resonances in the intensity of the fluorescence light, we measured τ 0 on several absorption lines in the 593 nm band with use of a single-mode cw dye laser and near 514 nm with use of a tuneable single-mode Ar-ion laser [30]. The experimental arrangements for the 'broad rf-resonance' and the 'σ -resonance' are the same as in the Hanle and optical radio-frequency double resonance experiments, which both represent a resonant change in the polarization of the fluorescence light.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 88%

“…by a static magnetic field or a radio-frequency field (rf-field) cause an increase in the absorption of NO 2 or equivalently an increase in the intensity F tot of the fluorescence light. We investigated two types of resonances in the intensity of the fluorescence light, the 'broad rf-resonance' [29] and the 'σ-resonance' [30]. The width of these resonances depends on the time constants τ 0 and on the transit time T L , but not on the light intensity I.…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

“…The superposition of the resonances in the intensity of the fluorescence light with the resonances in the polarization of the fluorescence light was not recognized e.g. in the early Hanle experiments [30][31][32]. Reproducible measurements on the 'σresonance' and the 'broad rf-resonance' were obtained after we used a reproducible adjustment procedure of the transit time T L [27,33].…”

Section: Comparison With Experimental Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Do extra compactified dimensions of space cause a substructure underlying the expected eigenstates of a molecule?

Weber

2019

J. Phys. Commun.

View full text Add to dashboard Cite

Experimental results on NO 2 are explained based on the ADD-model of large extra compactified dimensions of space. We assume that gravity is sufficiently strong in a compactification space of the size of the molecule to affect the vibrational motion of the nuclei by causing an asymmetric perturbation in the symmetric stretch vibrational motion of the optically excited state. At the same excitation energy, there are also other electronic states of different symmetry (conical intersection of potential energy surfaces), which may couple with the optically excited state. Due to the gravitational perturbation the nuclei being in the symmetric stretch vibration mode of the optically excited electronic state pass over into the asymmetric stretch vibration mode of an isoenergetic electronic state. This parity conserving change of the vibronic wave function enhances a small gravitational perturbation to an optically detectable signal. The perturbation is associated with a time constant of about 3 μs, which we attribute to fluctuations of the shape of the compactification space induced by a background cosmic field.

show abstract

The Hanle Effect and Level-Crossing Spectroscopy on Molecules

Weber

1991

The Hanle Effect and Level-Crossing Spectroscopy

View full text Add to dashboard Cite

NO2 lifetimes by hanle effect measurements

Cited by 16 publications

References 12 publications

An effect of extra compactified dimensions of space in the molecule $$\hbox {NO}_{{2}}$$

An effect of extra compactified dimensions of space in the molecule $$\hbox {NO}_{{2}}$$

Do extra compactified dimensions of space cause a substructure underlying the expected eigenstates of a molecule?

The Hanle Effect and Level-Crossing Spectroscopy on Molecules

Contact Info

Product

Resources

About