Experimental results

Correspondence to model

Explanations and comments

CL/SL/LIBL existence.

Fully compliant with the PeTa model.

It is necessary to have the number of the excited particles N ≥ 103 and N/V more than the threshold density of them.

OBSL emission has light pulses of ~10−11 s duration.

Fully compliant with the PeTa model.

tс is equal to ~10−11 s if N (the quantity of particles in the cloud) is N ≥ 105.

LIBL emission has light pulses of ~10−9 s duration, much more than CL/SL.

Does not contradict the PeTa model.

This is due to the relatively large volume of the bubble and the large number of particles N.

Every flash of OBSL/LIBL emits 105 - 108 photons.

Fully compliant with the PeTa model.

It corresponds to N ≥ 106 - 109 particles in the cloud.

The spectra of CL/SL/LIBL are large bands from IR, via visible, up to UV.

Fully compliant with the PeTa model.

The spectra are determined by the condensation of individual molecules and of clusters up to 36 molecules.

The spectra of CL/SL/LIBL increase the intensity from IR, via visible, up to UV.

Fully compliant with the PeTa model.

Decrease of distances between individual peaks.

In LIBL, the emission peak at 0.34 µm exists on the background of the main range.

Fully compliant with the PeTa model.

Existence in the protonated vapour of a large quantity of clusters with M = 21, the magic number of water molecules.

Noble gases increase CL and SL intensities.

Fully compliant with the PeTa model.

Noble gases form clusters with water vapour up to 60 molecules.

Intensity of CL and SL increases with decreasing liquid temperature.

Fully compliant with the PeTa model.

Two reasons: (1) the clusters in the water vapour are more stable at a low temperature; (2) it is easier to get a large supersaturation at lower temperatures.

Both the pulse widths in the red and the ultraviolet spectral range are identical.

Fully compliant with the PeTa model.

The mechanism of light emission is the same for different wavelengths; only the quantity of molecules in the clusters is different.

Bubble radii R0 are in the range ~2.3 μm - 2 mm.

Fully compliant with the PeTa model.

Two reasons: (1) Equation (19) is fulfilled; (2) for accommodation coefficient α = 0.1, during the expansion of the bubbles, these radii give a volume for the evaporation of liquid that is sufficient for N ≈ 107 particles in the cloud.

Frequencies of liquid perturbations: 1 Hz - 1 HHz; the corresponding duration of one cycle 1 s - 1 × 10−6 s.

These values are within the PeTa model.

For accommodation coefficient α = 0.1, during expansion of the bubbles, these frequencies give time for the evaporation of liquid that is sufficient for N ≈ 107 particles in the cloud.

There is some, but not too much, dissolved gas; degassing on ~20% from saturation.

Compliant with the PeTa model.

It gives a necessary pressure ratio of the gas and vapour in the bubble.

Calibrated measurements of bubble brightness in OBSL show that each flash contains about Ep ≈ 1 × 10−12 J energy.

Fully compliant with the PeTa model.

Our estimation gives Ep ≈ (1 × 10−10 - 1 × 10−12) J of energy; energy absorption by the water and the walls of the vessel has to be taken into account.

MBSL has a power of WSL ≈ 1.6 × 10−8 W from a volume of liquid ~ 6 × 10−5 m3, excited with 1 W of ultrasonic energy at 24 kHz.

It corresponds to the estimation for OBSL: WOBSL ≈ (10−7 - 10−4) W without taking into account any absorption; for MBSL, the number and sizes of emitting bubbles are unknown.

The absorption of radiation by liquid and glass or quartz must be taken into account.

Existence of other than 0.34 µm emission peaks in the background of the main range.

Does not contradict the PeTa model.

It is likely that their presence is due to the excitation of gases and other substances dissolved in the liquid; their excitation occurs under the influence of shock waves occurring in the liquid.

Flash occurs ~10−7 s before the minimum radius of the bubble

Does not contradict the PeTa model.

After the flash, a collapse occurs and then the bubble reaches a minimum size.