Dynamics of the laser fragmentation/laser-induced fluorescence process in nitrobenzene vapors

Sergei M. Bobrovnikov; Evgeny V. Gorlov; Viktor I. Zharkov; Yury N. Panchenko; Aleksey V. Puchikin

doi:10.1364/AO.57.009381

Applied Optics
Vol. 57,
Issue 31,
pp. 9381-9387
(2018)
•https://doi.org/10.1364/AO.57.009381

Dynamics of the laser fragmentation/laser-induced fluorescence process in nitrobenzene vapors

Sergei M. Bobrovnikov, Evgeny V. Gorlov, Viktor I. Zharkov, Yury N. Panchenko, and Aleksey V. Puchikin

Not Accessible

Your library or personal account may give you access

Get PDF
Email
Share
Get Citation
Copy Citation Text
Sergei M. Bobrovnikov, Evgeny V. Gorlov, Viktor I. Zharkov, Yury N. Panchenko, and Aleksey V. Puchikin, "Dynamics of the laser fragmentation/laser-induced fluorescence process in nitrobenzene vapors," Appl. Opt. 57, 9381-9387 (2018)

Export Citation
- BibTex
- Endnote (RIS)
- HTML
- Plain Text
Citation alert
Save article

Check for updates

Abstract

The paper presents the results of an experimental study of the dynamic characteristics of the laser fragmentation/laser-induced fluorescence (LF/LIF) effects in nitrobenzene vapors under the separate initiation of processes of photofragmentation and fluorescence of fragments by nanosecond laser pulses. It is shown that, due to the inertia of the dissociation mechanism of nitrobenzene molecules, the process of the fragments’ formation continues even after letup of excitation. The highest concentration of fragments is reached in a time several times greater than the standard fragmentation pulse duration of 10 ns. A kinetic model is presented that allows one to trace the temporal dynamics of the LF/LIF process of nitrobenzene vapors under separate excitation. A good agreement between the experimental data and the results of calculation indicates the adequacy of application of the developed kinetic model for describing the LF/LIF process. The information obtained in the experiment made it possible to clarify the values of the rate constants of the nitrobenzene dissociation.

Full Article | PDF Article

More Like This

Two-pulse laser fragmentation/laser-induced fluorescence of nitrobenzene and nitrotoluene vapors

Sergei M. Bobrovnikov, Evgeny V. Gorlov, Viktor I. Zharkov, Yury N. Panchenko, and Aleksey V. Puchikin
Appl. Opt. 58(27) 7497-7502 (2019)

Laser photofragmentation–fragment detection and pyrolysis–laser-induced fluorescence studies on energetic materials

Vaidhianat Swayambunathan, Gurbax Singh, and Rosario C. Sausa
Appl. Opt. 38(30) 6447-6454 (1999)

Detection of condensed-phase explosives via laser-induced vaporization, photodissociation, and resonant excitation

C. M. Wynn, S. Palmacci, R. R. Kunz, K. Clow, and M. Rothschild
Appl. Opt. 47(31) 5767-5776 (2008)

Previous Article Next Article

Cited By

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Figures (6)

You do not have subscription access to this journal. Figure files are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Tables (2)

You do not have subscription access to this journal. Article tables are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Equations (12)

You do not have subscription access to this journal. Equations are available to subscribers only. You may subscribe either as an Optica member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Login to access Optica Member Subscription

Parameter	Value
Parameter	Nd:YAG laser (fragmenting)	KrF laser (sensing)
Radiation wavelength, nm	266	247.87
Tuning range, nm	–	247.60–249.50
Maximum pulse energy, mJ	120	10
Linewidth, pm	30	5
Pulse repetition rate, Hz	1–10	1–10
Pulse duration ( $τ_{0.5}$ ), ns	10	20
Beam divergence, mrad	1	1
Output beam diameter, mm	$Ø 8$	$18 \times 9$

Parameter		Value
Parameter		Fragmenting Pulse $(λ_{1} = 266 nm)$	Sensing Pulse $(λ_{2} = 247.87 nm)$
Absorption cross section of nitrobenzene molecule	$σ_{NB}$ , $10^{- 18} {cm}^{2}$	3 [29]	21 [29]
Cross section of an ${NO}_{2}$ molecule	$σ_{NO 2}$ , $10^{- 18} {cm}^{2}$	0.02 [29]	0.009 [29]
Cross section of an NO molecule	$σ_{NO}$ , $10^{- 18} {cm}^{2}$	–	0.56
Weight coefficient	$α (λ)$	0.29 [26]	0.21 [26]
Weight coefficient	$β (λ)$	0.1	0.1 [10]
Weight coefficient	$γ (λ)$	0.1 [30]	0.1 [30]
Absorption rate constant	$k_{01}$	$σ_{NB} \times F_{1}$ ^a	$σ_{NB} \times F_{2}$
Absorption rate constant	$k_{56}$	$σ_{NO 2} \times F_{1}$	$σ_{NO 2} \times F_{2}$
Absorption rate constant	$k_{78}$	$σ_{NO 2} \times F_{1}$	$σ_{NO 2} \times F_{2}$
Absorption rate constant	$k_{34}$	–	$σ_{NO} \times F_{2}$
Absorption rate constant $NB + h ν \to C_{6} H_{5} O + NO$	$k_{13} (λ), s^{- 1}$	$7.2 \times 10^{6}$ [26]	$2.7 \times 10^{7}$ [26]
Decay rate constant $NB + h ν \to C_{6} H_{5} + {NO}_{2}$	$k_{15} (λ), s^{- 1}$	$8 \times 10^{7}$ [26]	$3 \times 10^{8}$ [26]
Nonradiative transition rate constant NO $(X^{2} Π (v^{''} = 2)) \to NO (X^{2} Π (v^{''} = 0, 1))$	$k_{32}, s^{- 1}$	$3.8 \times 10^{5}$ [28]
Decay rate constant ${NO}_{2} + h ν \to NO + O$	$k_{6} = k_{8}, s^{- 1}$	$2.5 \times 10^{10}$ [31]
Radiative transition rate constant NO $(A^{2} Σ^{+}) \to NO (X^{2} Π) + h ν$	$k_{r}, s^{- 1}$	$4.9 \times 10^{6}$ [32]
Nonradiative transition $rate constant$ NO $((A^{2} Σ^{+}) \to NO (X^{2} Π))$	$k_{n r}, s^{- 1}$	$8.1 \times 10^{8}$ [33]

Parameter	Value
Parameter	Nd:YAG laser (fragmenting)	KrF laser (sensing)
Radiation wavelength, nm	266	247.87
Tuning range, nm	–	247.60–249.50
Maximum pulse energy, mJ	120	10
Linewidth, pm	30	5
Pulse repetition rate, Hz	1–10	1–10
Pulse duration ( $τ_{0.5}$ ), ns	10	20
Beam divergence, mrad	1	1
Output beam diameter, mm	$Ø 8$	$18 \times 9$

Parameter		Value
Parameter		Fragmenting Pulse $(λ_{1} = 266 nm)$	Sensing Pulse $(λ_{2} = 247.87 nm)$
Absorption cross section of nitrobenzene molecule	$σ_{NB}$ , $10^{- 18} {cm}^{2}$	3 [29]	21 [29]
Cross section of an ${NO}_{2}$ molecule	$σ_{NO 2}$ , $10^{- 18} {cm}^{2}$	0.02 [29]	0.009 [29]
Cross section of an NO molecule	$σ_{NO}$ , $10^{- 18} {cm}^{2}$	–	0.56
Weight coefficient	$α (λ)$	0.29 [26]	0.21 [26]
Weight coefficient	$β (λ)$	0.1	0.1 [10]
Weight coefficient	$γ (λ)$	0.1 [30]	0.1 [30]
Absorption rate constant	$k_{01}$	$σ_{NB} \times F_{1}$ ^a	$σ_{NB} \times F_{2}$
Absorption rate constant	$k_{56}$	$σ_{NO 2} \times F_{1}$	$σ_{NO 2} \times F_{2}$
Absorption rate constant	$k_{78}$	$σ_{NO 2} \times F_{1}$	$σ_{NO 2} \times F_{2}$
Absorption rate constant	$k_{34}$	–	$σ_{NO} \times F_{2}$
Absorption rate constant $NB + h ν \to C_{6} H_{5} O + NO$	$k_{13} (λ), s^{- 1}$	$7.2 \times 10^{6}$ [26]	$2.7 \times 10^{7}$ [26]
Decay rate constant $NB + h ν \to C_{6} H_{5} + {NO}_{2}$	$k_{15} (λ), s^{- 1}$	$8 \times 10^{7}$ [26]	$3 \times 10^{8}$ [26]
Nonradiative transition rate constant NO $(X^{2} Π (v^{''} = 2)) \to NO (X^{2} Π (v^{''} = 0, 1))$	$k_{32}, s^{- 1}$	$3.8 \times 10^{5}$ [28]
Decay rate constant ${NO}_{2} + h ν \to NO + O$	$k_{6} = k_{8}, s^{- 1}$	$2.5 \times 10^{10}$ [31]
Radiative transition rate constant NO $(A^{2} Σ^{+}) \to NO (X^{2} Π) + h ν$	$k_{r}, s^{- 1}$	$4.9 \times 10^{6}$ [32]
Nonradiative transition $rate constant$ NO $((A^{2} Σ^{+}) \to NO (X^{2} Π))$	$k_{n r}, s^{- 1}$	$8.1 \times 10^{8}$ [33]

Abstract

Cited By

Figures (6)

Tables (2)

Equations (12)

Applied Optics