• M N Dixit

      Articles written in Pramana – Journal of Physics

    • Rotational analysis of the ultraviolet bands of PS

      T K Balasubramanian M N Dixit N A Narasimham

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      The 2-0, 1-0 and 0-0 bands of the ultraviolet system of PS have been analysed for their rotational structure. It is shown that they involve the transitionC2Σ -X2 Πr(a). TheC2Σ state shows a significant spin doubling.

    • Relative photodissociation cross-section of NaCs molecule, using argon ion laser lines

      A Sharma M N Dixit G L Bhale

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      Laser-induced photodissociation of NaCs molecule has been observed when a mixture of Na and Cs metal vapour in a glass cell was irradiated by most of the lines of an argon ion laser. The photodissociation results in the 3P state of Na atoms which is correlated with theF1Σ+ and G1π molecular states of NaCs. Distribution of photofragments over fine structure components 32P3/2 and 32P1/2 of Na has been studied. The ratio of intensity ofD2 line (5890 Å) toD1 line (5896 Å) of Na varies from around 2 at 5145 Å to about 3.5 at 4579 Å. The relative photodissociation cross-section increases monotonically as the wave-length of laser light decreases from 5145 Å to 4579 Å. It is seen that the 4579 Å photon is about 200 times more effective than the 5145 Å photon in causing the photoreaction NaCs + (Ar+ photon) → Na*(3P) + Cs(6S).

    • On the non-BoltzmannA-X emission in Na2 following laser excitation of theB state

      A Sharma G L Bhale M A N Razvi M N Dixit

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      A1Σu+-X1Σg+ emission in Na2 is observed following excitation ofB1πu by various lines of an argon ion laser. The excitation energy ofB1πu is collisionally transferred to the (2)1Σg+ which then radiatively populates theA1Σu+ state. The Na vapour is contained in a stainless steel crossed heat pipe with Ar buffer gas and temperature around 600°C. For all laser lines except 4579 Å, the coarse features ofA-X emission are independent of the laser wavelength. However, at high resolution the finer differences between different laser line excitation are explained. Variousv′-v″ transitions in this emission are identified. Computer simulation is presented to help explain some features of this emission.

    • Ground-state recovery of coumarin dyes by pump-probe technique with picosecond pulses

      K Chandrasekhar S R Inamdar M N Dixit N N Math

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      Rotation-free transmission measurements governed by ground-state recovery of coumarin 102, coumarin 138 and coumarin 339 dyes in ethanol solutions were performed for the first time by pump-probe technique using 35 ps pulses of Nd:YAG laser at 355 nm. Recovery of absorption is characterized by simple exponential behaviour with relaxation times of 4.0, 3.7 and 3.0 ns respectively for C 102, C 138 and C 339. These values are comparable to the lifetimes of the first excited singlet states.

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