Our findings revealed that the incident beam rotational temperature typically ranged from 10 K to 15 K for T n = 300 K and increased to 55 K at T n = 838 K. The spread in E i (∆E/E, full width at half maximum), measured at different T n ranged from 20% to 56% for 300 K to 853 K, respectively. The estimates for E i were found to be consistent with the following relation: